marchetti_2006
==============

S\. Marchetti and R\. Simili, Infrared Phys\. Technol\. 47, 263 \(2006\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/marchetti_2006.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1016/j\.infrared\.2004\.12\.005 <https://doi.org/10.1016/j.infrared.2004.12.005>`__

**Source kind:** measurement

**Recorded technique:** Differential Fabry\-Perot interferometry at 10\.57 um\: a pulsed, single\-mode, tunable RF\-excited CO2 laser \(linewidth \< 13 MHz\) probes two equal 222\.4 cm resonators, one containing a 208\.9 cm gas cell with ZnSe Brewster windows; the fringe shift is counted while the pressure changes and then measured differentially between two extreme pressures at the same temperature\. Table temperature to 0\.1 degrees C; air drift of the reference resonator corrected \(0\.35 FD per degree C\) \(pp\. 263\-265\)\.

**Materials in structured entries:** CO2, He, N2, O2

**Dataset quantities:** refractivity, refractivity\_per\_density

**Contents:** 15 datasets; 0 formulas.

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

Values are pressure coefficients alpha\_P with n = 1 \+ alpha\_P P, 'measured at 23 degrees C' \(Table 1, captioned '@ 296 °C', i\.e\. 296 K\), in 1e\-4 per atm; the uncertainty in the last digits is printed under each value\. The abstract claims 'alpha\_P has been measured with 5e\-3 accuracy' \(true for CO2, N2, O2; helium's 0\.326\(12\) is 3\.7 %\)\. The level of the uncertainties is not stated\. Here each alpha\_P is the refractivity at 1 atm and 296 K, with the ideal\-gas density \(the paper converts with the perfect\-gas relation, Eq\. 3, and uses no virial correction\)\.

Table 2's alpha\_rho = \(n \- 1\)/rho in cm^3/mol \(not the Lorentz\-Lorenz molar refractivity, which is about 2/3 of it\) is Table 1 times R T for this work, and compares Simmons \(1978; 10\.59 and 0\.633 um\), Achtermann et al\. \(1991; 0\.633 um\) and theory\: Edlen \(1966\) and Old, Gentili and Peck \(1971\) for CO2, 'as reported in' Ciddor \(2002\), and Ciddor \(1996\) for air\. The datasets store it as a refractivity per density with scale 1/N\_A = 1\.6605390671738466e\-24 \(cm^3 per molecule\), at the state 1 atm, 296 K \(ideal gas\)\: the conversion is linear, so the state matters only through Lorentz\-Lorenz\. The authors think Simmons's values 'instrumentally overestimated' \(p\. 266\)\. Air is not a curated species and is skipped; the paper's 'synthetic air' 0\.19 O2 \+ 0\.81 N2 agrees with its air value\.

Wavelengths\: 10\.57 um \(the laser line; the medium is immaterial at this precision\), 10\.59 and 0\.633 um as printed\.

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

Datasets
--------

marchetti\_2006/alpha\_p\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_p_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__alpha_p_CO2.csv",
     "table": "tbl_fcf07d146f15",
     "quantity": "refractivity",
     "scale": 0.0001,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 1, alpha\_P of CO2 at 10\.57 um, 23 degrees C, as the refractivity at 1 atm\.

marchetti\_2006/alpha\_p\_N2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_p_N2",
     "material": "N2",
     "file": "N2/marchetti_2006__alpha_p_N2.csv",
     "table": "tbl_fcf07d146f15",
     "quantity": "refractivity",
     "scale": 0.0001,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 1, alpha\_P of N2 at 10\.57 um, 23 degrees C, as the refractivity at 1 atm\.

marchetti\_2006/alpha\_p\_O2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_p_O2",
     "material": "O2",
     "file": "O2/marchetti_2006__alpha_p_O2.csv",
     "table": "tbl_fcf07d146f15",
     "quantity": "refractivity",
     "scale": 0.0001,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 1, alpha\_P of O2 at 10\.57 um, 23 degrees C, as the refractivity at 1 atm\.

marchetti\_2006/alpha\_p\_He
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_p_He",
     "material": "He",
     "file": "He/marchetti_2006__alpha_p_He.csv",
     "table": "tbl_fcf07d146f15",
     "quantity": "refractivity",
     "scale": 0.0001,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 1, alpha\_P of He at 10\.57 um, 23 degrees C, as the refractivity at 1 atm\.

marchetti\_2006/alpha\_rho\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_rho_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__alpha_rho_CO2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, this work\: Table 1 converted with R T \(Eq\. 3\), not independent\.

marchetti\_2006/alpha\_rho\_N2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_rho_N2",
     "material": "N2",
     "file": "N2/marchetti_2006__alpha_rho_N2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, this work\: Table 1 converted with R T \(Eq\. 3\), not independent\.

marchetti\_2006/alpha\_rho\_O2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_rho_O2",
     "material": "O2",
     "file": "O2/marchetti_2006__alpha_rho_O2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, this work\: Table 1 converted with R T \(Eq\. 3\), not independent\.

marchetti\_2006/alpha\_rho\_He
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "alpha_rho_He",
     "material": "He",
     "file": "He/marchetti_2006__alpha_rho_He.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, this work\: Table 1 converted with R T \(Eq\. 3\), not independent\.

marchetti\_2006/simmons\_1978\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "simmons_1978_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__simmons_1978_CO2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "A. C. Simmons, Opt. Commun. 25, 211 (1978)"
     ],
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, note b\: Simmons at 10\.59 and 0\.633 um\. The 0\.633 um N2 cell is printed 7\.219 with \(73\) wrapped to the next line\.

marchetti\_2006/simmons\_1978\_N2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "simmons_1978_N2",
     "material": "N2",
     "file": "N2/marchetti_2006__simmons_1978_N2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "A. C. Simmons, Opt. Commun. 25, 211 (1978)"
     ],
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2, note b\: Simmons at 10\.59 and 0\.633 um\. The 0\.633 um N2 cell is printed 7\.219 with \(73\) wrapped to the next line\.

marchetti\_2006/achtermann\_1991\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "achtermann_1991_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__achtermann_1991_CO2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "H. J. Achtermann, G. Magnus and T. K. Bose, J. Chem. Phys. 94, 5669 (1991)"
     ]
   }

Table 2, note c\: Achtermann et al\. at 0\.633 um, as alpha\_rho \(no uncertainty printed\)\.

marchetti\_2006/achtermann\_1991\_N2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "achtermann_1991_N2",
     "material": "N2",
     "file": "N2/marchetti_2006__achtermann_1991_N2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "H. J. Achtermann, G. Magnus and T. K. Bose, J. Chem. Phys. 94, 5669 (1991)"
     ]
   }

Table 2, note c\: Achtermann et al\. at 0\.633 um, as alpha\_rho \(no uncertainty printed\)\.

marchetti\_2006/achtermann\_1991\_He
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "achtermann_1991_He",
     "material": "He",
     "file": "He/marchetti_2006__achtermann_1991_He.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "H. J. Achtermann, G. Magnus and T. K. Bose, J. Chem. Phys. 94, 5669 (1991)"
     ]
   }

Table 2, note c\: Achtermann et al\. at 0\.633 um, as alpha\_rho \(no uncertainty printed\)\.

marchetti\_2006/edlen\_theory\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "edlen_theory_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__edlen_theory_CO2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "B. Edlen, Metrologia 2, 71 (1966), as reported in P. E. Ciddor, Appl. Optics 41, 2292 (2002)"
     ]
   }

Table 2, note e\: Edlen's CO2 value 'as reported in' Ciddor \(2002\), from ultraviolet resonances only\.

marchetti\_2006/old\_theory\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "old_theory_CO2",
     "material": "CO2",
     "file": "CO2/marchetti_2006__old_theory_CO2.csv",
     "table": "tbl_a64b03e950d7",
     "quantity": "refractivity_per_density",
     "unit": "cm3",
     "scale": 1.6605390671738466e-24,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_atm": 1,
       "temperature_k": 296
     },
     "density": "ideal",
     "use": "reproduced",
     "reproduced_from": [
       "J. G. Old, K. L. Gentili and E. R. Peck, J. Opt. Soc. Am. 61, 89 (1971), as reported in P. E. Ciddor, Appl. Optics 41, 2292 (2002)"
     ]
   }

Table 2, note f\: Old et al\.'s CO2 value, including the infrared resonance, 'as reported in' Ciddor \(2002\)\.

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.