hyman_1977 ========== H\. A\. Hyman, "Photoionization cross sections for excited states of argon and krypton", Appl\. Phys\. Lett\. 31, 14 \(1977\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1063/1\.89481 `__ **Source kind:** theory **Recorded technique:** Calculated one\-photon photoionisation cross sections of the excited Ar\(4s\), Ar\(4p\), Kr\(5s\) and Kr\(5p\) states for the KrF laser \(Eq\. 1, sigma = 2\.69e\-18 \(I \+ epsilon\) x the l \+\- 1 radial matrix elements squared, energies in Ry\)\: a central\-field model, the bound and continuum orbitals of one potential, the parent ion's potential from Clementi and Roetti's Hartree\-Fock functions plus a polarisation potential alpha / \(r^2 \+ r0^2\)^2 \(Ar\: r0 = 1\.56 a0, alpha = 8\.85 a0^3; Kr\: r0 = 1\.84 a0, alpha = 14\.9 a0^3; Eq\. 4, p\. 15\)\. Spin\-orbit effects are neglected\: the two series converging on the 2P3/2 and 2P1/2 ions are 'effectively collapsed into one series of levels' averaged over the total angular momentum and the core state \(p\. 14\)\. **Materials in structured entries:** Ar, Kr **Dataset quantities:** excited\_state\_photoionization\_cross\_section **Contents:** 4 datasets; 0 formulas. Curation notes -------------- Appl\. Phys\. Lett\. 31\(1\), 14\-15 \(1 July 1977\) = PDF pages 2\-3 of AIP's download, behind AIP's cover page \(PDF p\. 1\); scanned pages, each one image with a text layer\. Identity checked against the first page of the article \(journal, volume, pages, date, title, author\)\. Table I checked against the table image and the rendered page \(p\. 15\)\. LEVELS\. Each 'state' is a configuration average\: Ar\(4p\) is 3p5 4p, Kr\(5p\) 4p5 5p, averaged over J and over the two core states \(p\. 14\); Ar\(4s\) and Kr\(5s\) include the metastable 3P0,2 levels 'as well as the two 3P1 levels, which are optically trapped' \(p\. 14\)\. The paper prints no ionisation energy of these averaged levels; Fig\. 1 draws the levels against an energy axis \(eV\) but prints no level energy as a number\. WHAT IS TAKEN \(tools/extract/hyman\_1977\.py\)\. Table I \(p\. 15\), the cross sections at 'lambda = 2486 A' \(the KrF laser, '5 eV', p\. 14; whether in air or vacuum is not said, a difference of 0\.07 nm\)\: Ar\(4s\) 2\.1 x 10^\-20, Ar\(4p\) 4\.3 x 10^\-18, Kr\(5s\) 1\.3 x 10^\-19, Kr\(5p\) 4\.5 x 10^\-18 cm2\. The library's cells are an OCR \('4\. 3x 10\-18'\), kept in 'printed'\. No uncertainty is stated; the paper expects the p\-state values to be 'relatively insensitive to the model and \.\.\. more accurate', and the s\-state values, near a zero of the matrix element, 'very sensitive to the details of the model' \(p\. 15\)\. All are checks\: a central\-field model of configuration\-averaged levels\. CHECKED \(the script\)\. The text repeats Table I's Ar\(4p\) 4\.3 x 10^\-18 \(p\. 15\) and the abstract's '~4\.5 x 10^\-18' for the p states\. Figs\. 2 and 3 read from the page images \(record of the method in the script\)\: Table I's Ar\(4p\) value lies on Fig\. 2's curve at epsilon = 0\.167 Ry and Kr\(5p\)'s on Fig\. 3's at 0\.170 Ry, so with the photon energy of 2486 A \(0\.3667 Ry of 13\.6 eV\) the calculation's binding energies are 2\.72 eV \(Ar 4p\) and 2\.68 eV \(Kr 5p\) \(\+\- 0\.03 eV from the reading, see the register\)\. The traced curves, drawn back on the page images, were inspected \(overlays\)\. COMPARISONS\. dakka\_2018 \(Table I, 'Literature'\) quotes sigma\_ei = 3\.3 x 10^\-18 cm2 for Kr 2p6 \(4p5 5p\[3/2\]2\) at 215 nm, 'Calculated from' this paper\: Fig\. 3's 5p curve, read 0\.0573 Ry \(the photon\-energy difference between 215 nm and 2486 A\) above the point where it has Table I's value, gives 3\.39 x 10^\-18 cm2, so the quotation is this calculation's configuration average carried to 215 nm along Fig\. 3 \(agreement 3 %, within the reading\)\. chang\_1982 \(Table II\) prints the later Duzy and Hyman values \(Phys\. Rev\. A 22, 1978 \(1980\), as printed there\) at 248 nm, 5\.4 \(Ar 4p\) and 5\.2 \(Kr 5p\) Mb, 26 and 16 % above this paper's 4\.3 and 4\.5 at 248\.6 nm; its own length\-form 4\.8 and 4\.5 Mb at 248 nm are, as it says, closer to this paper's than to Duzy and Hyman's\. chang\_1982's calculated binding energies \(Ry / n\*^2\: Ar 4p 2\.56, Kr 5p 2\.42 eV\) are below the 2\.72 and 2\.68 eV implied here\. NOT TAKEN\. Figs\. 2 and 3 \(pp\. 14\-15\), sigma of the 4s and 4p \(Ar\) and 5s and 5p \(Kr\) states against the photoelectron's excess energy epsilon from 0 to 1 Ry, raster scans\: the quantity is held against the photon's wavelength, and the photon energy of a point needs the level's ionisation energy, which is printed nowhere \(it could only be read off Fig\. 1's drawing, a second raster reading under every abscissa\)\. Dunning and Stebbings's threshold upper bounds for Ar\(4s 3P0,2\), 1\.1 x 10^\-18, and Kr\(5s 3P0,2\), 4\.9 x 10^\-19 cm2 \(F\. B\. Dunning and R\. F\. Stebbings, Phys\. Rev\. A 9, 2378 \(1974\); bounds at an unstated photon energy, not in the library\)\. The Ar\(4s\) value renormalised to that bound, '~1\.5 x 10^\-19 cm2' at 2486 A \(p\. 15\)\: a rescaling, not a calculation\. **Recorded bibliographic identity status:** VALIDATED. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- hyman\_1977/table1\_4s ~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table1_4s", "material": "Ar", "file": "Ar/hyman_1977__table1_4s.csv", "table": "tbl_ae5d166a6610", "quantity": "excited_state_photoionization_cross_section", "unit": "cm2", "abscissa_unit": "angstrom", "use": "check", "parameters": { "initial_level": "Ar 3p5 4s, averaged over J and the core state (the 3P0,2 metastable levels and 'the two 3P1 levels', p. 14)", "method": "central-field model (Hartree-Fock ion potential plus a polarisation potential), no spin-orbit" } } Table I \(p\. 15\), Ar\(4s\) at 2486 A\: 2\.1 x 10^\-20 cm2\. No uncertainty is stated; the s\-state values are 'very sensitive to the details of the model' \(p\. 15\)\. hyman\_1977/table1\_4p ~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table1_4p", "material": "Ar", "file": "Ar/hyman_1977__table1_4p.csv", "table": "tbl_ae5d166a6610", "quantity": "excited_state_photoionization_cross_section", "unit": "cm2", "abscissa_unit": "angstrom", "use": "check", "parameters": { "initial_level": "Ar 3p5 4p, averaged over J and the core state", "method": "central-field model (Hartree-Fock ion potential plus a polarisation potential), no spin-orbit" } } Table I \(p\. 15\), Ar\(4p\) at 2486 A\: 4\.3 x 10^\-18 cm2 \(repeated on p\. 15\)\. No uncertainty is stated\. hyman\_1977/table1\_5s ~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table1_5s", "material": "Kr", "file": "Kr/hyman_1977__table1_5s.csv", "table": "tbl_ae5d166a6610", "quantity": "excited_state_photoionization_cross_section", "unit": "cm2", "abscissa_unit": "angstrom", "use": "check", "parameters": { "initial_level": "Kr 4p5 5s, averaged over J and the core state (the 3P0,2 metastable levels and 'the two 3P1 levels', p. 14)", "method": "central-field model (Hartree-Fock ion potential plus a polarisation potential), no spin-orbit" } } Table I \(p\. 15\), Kr\(5s\) at 2486 A\: 1\.3 x 10^\-19 cm2\. No uncertainty is stated; the s\-state values are 'very sensitive to the details of the model' \(p\. 15\)\. hyman\_1977/table1\_5p ~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table1_5p", "material": "Kr", "file": "Kr/hyman_1977__table1_5p.csv", "table": "tbl_ae5d166a6610", "quantity": "excited_state_photoionization_cross_section", "unit": "cm2", "abscissa_unit": "angstrom", "use": "check", "parameters": { "initial_level": "Kr 4p5 5p, averaged over J and the core state", "method": "central-field model (Hartree-Fock ion potential plus a polarisation potential), no spin-orbit" } } Table I \(p\. 15\), Kr\(5p\) at 2486 A\: 4\.5 x 10^\-18 cm2 \(the abstract's '~4\.5 x 10^\-18' for the p states\)\. No uncertainty is stated\. 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 ` for the checks and decisions.