swift_1988#

K. M. Swift, L. A. Schlie and R. D. Rathge, Appl. Opt. 27, 4377 (1988)

Source record · Catalogue · Review register

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#

{
  "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#

{
  "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#

{
  "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#

{
  "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#

{
  "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#

{
  "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#

{
  "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 review register for the checks and decisions.