liu_2009
========

J\. Liu, E\. J\. Salumbides, U\. Hollenstein, J\. C\. J\. Koelemeij, K\. S\. E\. Eikema, W\. Ubachs and F\. Merkt, "Determination of the ionization and dissociation energies of the hydrogen molecule", J\. Chem\. Phys\. 130, 174306 \(2009\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/liu_2009.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1063/1\.3120443 <https://doi.org/10.1063/1.3120443>`__

**Source kind:** measurement

**Recorded technique:** The ionisation energy of ortho\-H2 as a sum of intervals \(Fig\. 1, Table II\)\: X \(v = 0, N = 1\) \-\> EF 1Sigma\_g\+ \(v = 0, N = 1\), from Hannemann et al\. 2006 \(their Ref\. 5\); EF \(0, 1\) \-\> the 54p1\_1\(0\) Rydberg state, measured here; and the 54p1\_1\(0\) binding energy relative to the centre of gravity of the X\+ \(v\+ = 0, N\+ = 1\) hyperfine structure, from Osterwalder et al\. 2004 \(Ref\. 6\) and Karr et al\. 2008 \(Ref\. 25\)\. The measurement\: a skimmed pulsed supersonic H2 beam \(2 bar stagnation\), two\-step excitation, a nonresonant two\-photon step at 202 nm \(pulsed dye laser, ~0\.4 cm^\-1 bandwidth, exciting all Doppler components\) and a 397 nm step \(second harmonic of a cw\-seeded pulsed Ti\:Sa amplifier, ~20 MHz bandwidth, delayed by 50 ns\), with co\- and counterpropagating 397 nm beams to cancel the first\-order Doppler shift; delayed pulsed\-field ionisation; calibration against Doppler\-free I2 lines \(comb\-measured positions\) and an etalon; the amplifier's frequency shift measured by heterodyne \(pp\. 2\-4\)\. The para\-H2 \(conventional\) value adds the X \(0, 1\) \- X \(0, 0\) interval \(Jennings et al\. 1984, Ref\. 8\) and subtracts the X\+ \(0, 1\) \- X\+ \(0, 0\) interval \(Korobov, Refs\. 9\-11\) \(p\. 6\)\.

**Materials in structured entries:** H2

**Dataset quantities:** ionization\_energy

**Contents:** 20 datasets; 0 formulas.

Curation notes
--------------

PDF pages 1\-9 \(page 1 is the publisher's cover sheet; PDF page 2 = 174306\-1; pages cited are PDF pages\)\. Identity checked on the first page \(PDF p\. 2\)\. The library flags unmapped glyphs on every page \(parentheses rendered as other characters\)\: every number taken was read on the table images \(Tables II and III\) or on the rendered page \(the equations under Table II, p\. 6\)\.

NOMENCLATURE\: in H2 the para levels have even N, so E\_i\(H2\) = E\_i\(para\-H2\) = X\+ 2Sigma\_g\+ \(v\+ = 0, N\+ = 0\) \- X 1Sigma\_g\+ \(v = 0, N = 0\) is the conventional \(rotationless\) ionisation energy; E\_i\(ortho\-H2\) = X\+ \(v\+ = 0, N\+ = 1, centre of gravity of the hyperfine structure\) \- X \(v = 0, N = 1\) \(Table II; p\. 5\: 'This value corresponds to the center of gravity of the hyperfine structure components of the N\+ = 1 level of H2\+'\)\. The hyperfine splittings of X \(0, 1\) \(\< 500 kHz\) and EF \(0, 1\) are neglected \(p\. 5\)\.

EXTRACTED\: \- ie\_ortho\_H2 \(inline; p\. 6, the equation under Table II\)\: E\_i\(ortho\-H2\) = \(2\) \+ \(3\) \- \(4\) \+ \(5\) \+ \(6\) = 124 357\.237 97\(36\) cm^\-1\. Table II's intervals reproduce it to 1e\-5 cm^\-1 \(the sum with \(4\) taken as the mean of its three hyperfine components, 4\.791 89, is 124 357\.237 979; the paper does not say how it averaged\)\. 'The overall uncertainty \.\.\. is determined as quadrature summation of the uncertainties of all energy level intervals' \(p\. 5\)\: sqrt\(0\.18^2 \+ 0\.29^2 \+ 0\.10^2\) = 0\.36 \(1e\-3 cm^\-1\) reproduces the \(36\)\. \- ie\_para\_H2 \(Table III, 'This work' row, tbl\_c65377ced290; also abstract p\. 2, text p\. 6 and p\. 7\)\: E\_i\(H2\) = E\_i\(para\-H2\) = \(1\) \+ E\_i\(ortho\-H2\) \- \(7\) = 124 417\.491 13\(37\) cm^\-1 \(the table's year column prints 2008\)\. The intervals give 124 417\.491 144, 1\.4e\-5 cm^\-1 above the printed value \(well inside the uncertainty\); the quadrature sum with \(1\)'s 0\.10 gives 0\.37\. In eV \(not printed; hc = 1\.239841984e\-4 eV cm\)\: ortho 15\.4183325, para 15\.4258029 eV\. \- Table III \(p\. 8, tbl\_c65377ced290, image checked\)\: E\_i\(H2\) as determined 1969\-2002, reproduced, one dataset per row, with the references as the paper's list prints them \(p\. 9\)\. Theoretical values are printed without uncertainties\. The 1993 rows citing 'revised in 41' are shiner\_1993's two H2 values \(identical\); the 1993 theory row \(Ref\. 40\) is the Kolos & Rychlewski number shiner\_1993 prints\.

UNCERTAINTIES\: the EF \(0, 1\) \-\> 54p1\_1\(0\) interval is 25 209\.997 56 \+\- \(0\.000 22\)statistical \+\- \(0\.000 07\)systematic cm^\-1 \(p\. 5\), 'by adding the statistical and systematic errors' 25 209\.997 56\(29\); the statistical part is one standard deviation \(p\. 5\: 'the number in parentheses represents one standard deviation in the unit of the last digit', of the mean of 16 pairs of measurements on 4 days, 2 x 12 604\.998 80\(10\) cm^\-1 fundamental\)\. Error budget \(Table I, p\. 5, tbl\_db58936e3055; MHz on the fundamental, x 2 on the UV\)\: statistical, line centres of I2 \+\-0\.36 x 2 and H2 \+\-3\.0 x 2, ring\-laser nonlinearity \< \+\-1\.1 x 2, residual Doppler \< \+\-0\.32 x 2, sum in quadrature \+\-6\.5; systematic, FSR \+\-0\.012 x 2, I2 reference lines \< \+\-0\.1 x 2, Ti\:Sa amplifier shift \(\-4\.76 \+\- 0\.60\) x 2, doubling crystal \< \+\-0\.35, ac Stark \(\-1\.27 \+\- 0\.64\) x 2, dc Stark \(\+0\.77 \+\- 0\.39\) x 2, pressure \< \+0\.10 \+\- 0\.05; sum \-10\.4 \+\- 2\.0 MHz\. The confidence level of the totals is not named\.

COMPARISON\: holsch\_2019's ortho\-H2 value 124 357\.238 003\(11\) cm^\-1 is 3\.3e\-5 cm^\-1 above this paper's 124 357\.237 97\(36\) \(0\.1 sigma of this paper's uncertainty\)\. Hölsch et al\. \(their Ref\. 19\) describe their result as a 30\-fold improvement over this '2009 result'\.

NOT EXTRACTED \(notes only; no quantity\)\: \- Table II \(p\. 6, tbl\_335e888b87cd; cm^\-1\)\: \(1\) X \(0, 1\) \- X \(0, 0\) 118\.486 84\(10\) \[8\]; \(2\) EF \(0, 1\) \- X \(0, 1\) 99 109\.731 39\(18\) \[5\]; \(3\) 54p1\_1 \(S = 0, centre\) \- EF \(0, 1\) 25 209\.997 56\(29\) \[this work\]; \(4\) 54p1\_1 \(S = 0\), F = 1, 0, 2 \- 51d1\_1 \(G\+ = 1/2\), F = 0\: 4\.791 80, 4\.791 91, 4\.791 96 \[6\]; \(5\) X\+ \(0, 1, G\+ = 1/2\), F\+ = 1/2 \- 51d1\_1 \(G\+ = 1/2\), F = 0\: 42\.270 539\(10\) \[6\]; \(6\) X\+ \(0, 1, centre\) \- X\+ \(0, 1, G\+ = 1/2\), F\+ = 1/2\: 0\.030 379 61 \[25\]; \(7\) X\+ \(0, 1, centre\) \- X\+ \(0, 0\)\: 58\.233 675 1\(1\) \[9\-11\]\. The 54p1\_1\(0\) binding energy \-\(4\) \+ \(5\) \+ \(6\) is 37\.509 03 \(the text, p\. 2, quotes 37\.509 02\(2\) from Ref\. 6\)\. The library's CSV of this table lost the parentheses \('118\.486 8410\-'\); its OCR alternative and the image agree with the values above\. \- The dissociation energy \(Eqs\. \(12\)\-\(14\), p\. 7\)\: D0\(H2\) = 36 118\.069 62\(37\) cm^\-1 \(para, N = 0\), a 'hybrid experimental\-theoretical determination' \(abstract\), limited entirely by E\_i\(H2\)\. Against the theory of Wolniewicz 1995 \(36 118\.069\) and the experiment of Zhang et al\. 2004 \(36 118\.062\(10\)\) \(p\. 7\)\. Recalculated inputs \(CODATA 2006 constants\)\: E\_i\(H\) = 109 678\.771 742 6\(10\) cm^\-1 \(Eq\. \(9\), the hyperfineless 1 2S1/2 ground state; Eqs\. \(6\)\-\(8\)\: Dirac \-109 679\.043 564 75\(73\), recoil \-0\.000 794 340 7, Lamb shift 0\.272 616 53\(67\)\); E\_i\(H2\+\) = 131 058\.121 975\(49\) cm^\-1 \(Eq\. \(10\), Korobov's formulae, uncertainty from neglected higher\-order terms\); D0\(H2\+\) = 21 379\.350 232\(49\) cm^\-1 \(Eq\. \(11\); Moss 21 379\.3501\(1\)\)\. These are calculations \(H is not a curated material; H2\+'s ionisation energy is a theoretical value in a measurement record\), so they stay in notes\. \- The earlier values quoted in the introduction \(p\. 2\)\: E\_i\(H2\)exp = 124 417\.476\(12\) \(de Lange et al\. 2002, Table III's 2002 row\), D0\(H2\)exp = 36 118\.062\(10\) \(Zhang et al\. 2004\), and theory 124 417\.491 and 36 118\.069 \(Wolniewicz 1995, Table III's 1995 row\)\. \- Figs\. 2\-4 \(the field\-ionisation spectra, the calibration, the distribution of the measurements\) and Figs\. 5\-6 \(the potential diagram; E\_i\(H2\) against year\)\: figures, not digitised\.

**Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets
--------

liu\_2009/ie\_ortho\_H2
~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "ie_ortho_H2",
     "material": "H2",
     "table": "text",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "primary",
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 1), centre of gravity of the hyperfine structure",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 1), ortho-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

1 inline points in the source record.

p\. 6 \(174306\-5\), the equation printed under Table II\: E\_i\(ortho\-H2\) = \(2\) \+ \(3\) \- \(4\) \+ \(5\) \+ \(6\) = 124 357\.237 97\(36\) cm^\-1, from X \(v = 0, N = 1\) to the centre of gravity of the hyperfine structure of X\+ \(v\+ = 0, N\+ = 1\)\. Quadrature sum of the intervals' uncertainties; level not named \(record notes\)\. Superseded in precision by holsch\_2019/ie\_ortho\_H2 \(124 357\.238 003\(11\)\)\.

liu\_2009/ie\_para\_H2
~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "ie_para_H2",
     "material": "H2",
     "file": "H2/liu_2009__ie_para_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "primary",
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 'This work' row \(year printed 2008\), p\. 8; also the abstract \(p\. 2\) and the equation under Table II \(p\. 6\)\: E\_i\(H2\) = E\_i\(para\-H2\) = \(1\) \+ E\_i\(ortho\-H2\) \- \(7\) = 124 417\.491 13\(37\) cm^\-1, X \(v = 0, N = 0\) \-\> X\+ \(v\+ = 0, N\+ = 0\)\: the conventional ionisation energy\. 'The most precise and accurate experimental result of this quantity' \(p\. 8\)\. Quadrature sum; level not named \(record notes\)\.

liu\_2009/herzberg\_1969\_expt\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "herzberg_1969_expt_H2",
     "material": "H2",
     "file": "H2/liu_2009__herzberg_1969_expt_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "G. Herzberg, Phys. Rev. Lett. 23, 1081 (1969)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1969, Expt\., Ref\. 33\.

liu\_2009/herzberg\_1969\_theory\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "herzberg_1969_theory_H2",
     "material": "H2",
     "file": "H2/liu_2009__herzberg_1969_theory_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "G. Herzberg, Phys. Rev. Lett. 23, 1081 (1969)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     }
   }

Table III, 1969, Theor\., Ref\. 33\. Theoretical, printed without uncertainty\. The theoretical value of the same reference \(Ref\. 33 only is printed\)\.

liu\_2009/herzberg\_1972\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "herzberg_1972_H2",
     "material": "H2",
     "file": "H2/liu_2009__herzberg_1972_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "G. Herzberg and Ch. Jungen, J. Mol. Spectrosc. 41, 425 (1972)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1972, Expt\., Ref\. 24\.

liu\_2009/eyler\_1986\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "eyler_1986_H2",
     "material": "H2",
     "file": "H2/liu_2009__eyler_1986_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "E. E. Eyler, R. C. Short and F. M. Pipkin, Phys. Rev. Lett. 56, 2602 (1986)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1986, Expt\., Ref\. 34\.

liu\_2009/glab\_1987\_H2
~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "glab_1987_H2",
     "material": "H2",
     "file": "H2/liu_2009__glab_1987_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "W. L. Glab and J. P. Hessler, Phys. Rev. A 35, 2102 (1987)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1987, Expt\., Ref\. 35\.

liu\_2009/eyler\_1987\_ref34\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "eyler_1987_ref34_H2",
     "material": "H2",
     "file": "H2/liu_2009__eyler_1987_ref34_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "E. E. Eyler, R. C. Short and F. M. Pipkin, Phys. Rev. Lett. 56, 2602 (1986)",
       "E. E. Eyler, J. Gilligan, E. McCormack, A. Nussenzweig and E. Pollack, Phys. Rev. A 36, 3486 (1987)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1987, Expt\., Ref\. 34, revised in 36\.

liu\_2009/eyler\_1987\_ref35\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "eyler_1987_ref35_H2",
     "material": "H2",
     "file": "H2/liu_2009__eyler_1987_ref35_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "W. L. Glab and J. P. Hessler, Phys. Rev. A 35, 2102 (1987)",
       "E. E. Eyler, J. Gilligan, E. McCormack, A. Nussenzweig and E. Pollack, Phys. Rev. A 36, 3486 (1987)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1987, Expt\., Ref\. 35, revised in 36\.

liu\_2009/mccormack\_1989\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "mccormack_1989_H2",
     "material": "H2",
     "file": "H2/liu_2009__mccormack_1989_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "E. McCormack, J. M. Gilligan, C. Cornaggia and E. E. Eyler, Phys. Rev. A 39, 2260 (1989)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1989, Expt\., Ref\. 37\.

liu\_2009/jungen\_1990\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "jungen_1990_H2",
     "material": "H2",
     "file": "H2/liu_2009__jungen_1990_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "Ch. Jungen, I. Dabrowski, G. Herzberg and M. Vervloet, J. Chem. Phys. 93, 2289 (1990)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1990, Expt\., Ref\. 38\.

liu\_2009/gilligan\_1992\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "gilligan_1992_H2",
     "material": "H2",
     "file": "H2/liu_2009__gilligan_1992_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "J. M. Gilligan and E. E. Eyler, Phys. Rev. A 46, 3676 (1992)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1992, Expt\., Ref\. 39\.

liu\_2009/kolos\_1993\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "kolos_1993_H2",
     "material": "H2",
     "file": "H2/liu_2009__kolos_1993_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "W. Kołos and J. Rychlewski, J. Chem. Phys. 98, 3960 (1993)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     }
   }

Table III, 1993, Theor\., Ref\. 40\. Theoretical, printed without uncertainty\. The same number as shiner\_1993's ab initio column \(shiner\_1993/ab\_initio\_H2, 124 417\.471 cm^\-1, Kolos, private communication\)\.

liu\_2009/shiner\_1993\_ref37\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "shiner_1993_ref37_H2",
     "material": "H2",
     "file": "H2/liu_2009__shiner_1993_ref37_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "shiner_1993"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1993, Expt\., Ref\. 37, revised in 41\. Identical to shiner\_1993/mccormack\_H2 \(124 417\.507\(12\) cm^\-1\: McCormack et al\.'s Rydberg data with Shiner et al\.'s EF \<\- X recalibration\)\.

liu\_2009/shiner\_1993\_ref38\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "shiner_1993_ref38_H2",
     "material": "H2",
     "file": "H2/liu_2009__shiner_1993_ref38_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "shiner_1993"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1993, Expt\., Ref\. 38, revised in 41\. Identical to shiner\_1993/jungen\_1990\_H2 \(124 417\.484\(17\) cm^\-1\: Jungen et al\.'s 1990 analysis with Shiner et al\.'s recalibration\)\.

liu\_2009/wolniewicz\_1993\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "wolniewicz_1993_H2",
     "material": "H2",
     "file": "H2/liu_2009__wolniewicz_1993_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "L. Wolniewicz, J. Chem. Phys. 99, 1851 (1993)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     }
   }

Table III, 1993, Theor\., Ref\. 42\. Theoretical, printed without uncertainty\.

liu\_2009/meiners\_1994\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "meiners_1994_H2",
     "material": "H2",
     "file": "H2/liu_2009__meiners_1994_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "J.-C. D. Meiners, M.S. thesis, University of Delaware, 1994"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 1994, Expt\., Ref\. 43\.

liu\_2009/kolos\_1994\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "kolos_1994_H2",
     "material": "H2",
     "file": "H2/liu_2009__kolos_1994_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "W. Kołos, J. Chem. Phys. 101, 1330 (1994)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     }
   }

Table III, 1994, Theor\., Ref\. 44\. Theoretical, printed without uncertainty\.

liu\_2009/wolniewicz\_1995\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "wolniewicz_1995_H2",
     "material": "H2",
     "file": "H2/liu_2009__wolniewicz_1995_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "L. Wolniewicz, J. Chem. Phys. 103, 1792 (1995)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     }
   }

Table III, 1995, Theor\., Ref\. 4\. Theoretical, printed without uncertainty\. The 'latest theoretical' value the paper compares with \(p\. 2 and p\. 8\: 'believed to be accurate to within 0\.01 cm^\-1'\)\.

liu\_2009/de\_lange\_2002\_H2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "de_lange_2002_H2",
     "material": "H2",
     "file": "H2/liu_2009__de_lange_2002_H2.csv",
     "table": "tbl_c65377ced290",
     "quantity": "ionization_energy",
     "unit": "cm-1",
     "abscissa": "label",
     "use": "reproduced",
     "reproduced_from": [
       "A. de Lange, E. Reinhold and W. Ubachs, Phys. Rev. A 65, 064501 (2002)"
     ],
     "parameters": {
       "kind": "adiabatic",
       "final_state": "X+ 2Sigma_g+ (v+ = 0, N+ = 0)",
       "initial_state": "X 1Sigma_g+ (v = 0, N = 0), para-H2"
     },
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table III, 2002, Expt\., Ref\. 2\.

Formulas
--------

No formulas are recorded.

Corrections
-----------

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the :doc:`review register </register>` for the checks and decisions.