swift_1988 ========== K\. M\. Swift, L\. A\. Schlie and R\. D\. Rathge, Appl\. Opt\. 27, 4377 \(1988\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1364/ao\.27\.004377 `__ **Source kind:** measurement **Recorded technique:** Mach\-Zehnder interferometer with a 51\.5 cm stainless\-steel test cell \(49 cm quartz for I2, ICl\), fringes counted \(to 1/8 fringe\) while gas flowed slowly into the evacuated cell; Ar\+ laser lines, He\-Ne 6328 A and a cw photolytic atomic iodine laser at 1\.315 um\. Pressure by Wallace & Tiernan gauges \(2 %\), temperature by thermocouple \(1 K\); alpha from the slope of fringe count against pressure\. Ozone density from its absorption at 3021\.5 A \(cross section 1\.24e\-19 cm^2\), the O2 contribution subtracted \(pp\. 4377\-4380\)\. **Materials in structured entries:** Ar, CO2, He, N2, O2, O3, SF6 **Dataset quantities:** polarizability **Contents:** 7 datasets; 0 formulas. Curation notes -------------- Values are the polarizability volume alpha in 1e\-24 cm^3 per molecule, from Delta n = 2 pi alpha N \(Eq\. 2\) with the number density from the measured pressure and temperature \(ideal gas, no Lorentz\-Lorenz; the gases near room temperature; 'all the interferometric data had the proper temperature compensation'\)\. The Gladstone\-Dale constants in parentheses, beta = 2 pi alpha N\_s with N\_s = 2\.68e19 cm^\-3 \(Eq\. 5\), are alpha times a constant for every curated gas \(checked 2026\-09\-24\) and are not extracted\. Uncertainty\: the last column, 'the maximum uncertainty in the polarizability data' \(2 %, O3 10 %\), read as a bound; the number density was 'accurate to ~2%' \(p\. 4380\)\. The values are 'averages of several interferometric measurements'\. Wavelengths are the nominal laser lines as printed in A \(4579, 4880, 5145 Ar\+, 6328 He\-Ne, 13150 iodine\), conventionally air values for the visible lines; the medium is taken as standard air \(the difference, 3e\-4 in wavelength, is immaterial at 2 %\)\. H2O, Cl2, ICl, CF3I, I2 and n\-C3F7I are not curated species and are skipped; Table II \(laser\-device mixtures\) holds no new data\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- swift\_1988/experiment\_He ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_He", "material": "He", "file": "He/swift_1988__experiment_He.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. swift\_1988/experiment\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_N2", "material": "N2", "file": "N2/swift_1988__experiment_N2.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. swift\_1988/experiment\_O2 ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_O2", "material": "O2", "file": "O2/swift_1988__experiment_O2.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. swift\_1988/experiment\_Ar ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_Ar", "material": "Ar", "file": "Ar/swift_1988__experiment_Ar.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. swift\_1988/experiment\_CO2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_CO2", "material": "CO2", "file": "CO2/swift_1988__experiment_CO2.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. swift\_1988/experiment\_O3 ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_O3", "material": "O3", "file": "O3/swift_1988__experiment_O3.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.1, "level": "bound" } } Table I; ozone measured in O2 mixtures \(up to 40 % O3\), its density from UV absorption\. swift\_1988/experiment\_SF6 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "experiment_SF6", "material": "SF6", "file": "SF6/swift_1988__experiment_SF6.csv", "table": "tbl_98326ad22a2d", "quantity": "polarizability", "unit": "cm3", "scale": 1e-24, "abscissa_unit": "angstrom", "wavelength_medium": "standard_air", "use": "primary", "uncertainty": { "relative": 0.02, "level": "bound" } } Table I\. 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.