willetts_1982#

D. V. Willetts and M. R. Harris, J. Phys. D: Appl. Phys. 15, 51 (1982)

Source record · Catalogue · Review register

Source kind: measurement

Recorded technique: Interferometer at 10.59 um with a 1.0 m cell terminated in KCl windows, fringes counted with a pyroelectric detector as gas was removed from or admitted to the cell (p. 10); part of a study of the frequency sweeping of a hybrid TEA CO2 laser.

Materials in structured entries: CO2, He, N2

Dataset quantities: refractivity

Contents: 3 datasets; 0 formulas.

Curation notes#

Table 2 (p. 10, image checked) gives the refractivity and the Gladstone-Dale constant K of He, N2, CO2 and He:N2:CO2 mixtures at 10.59 um. The state is the text’s (p. 10): ‘for p = 103 kPa, T = 19 C’; the caption’s ‘1.03 kPa’ is a misprint (the refractivities are of order the 1 atm values; TC-149). The density reduction is not stated; at this precision (2.5-6 %) the difference between ideal and real gas is immaterial, and ideal is recorded. The wavelength is the CO2 laser’s 10.59 um, taken as vacuum (the air-vacuum difference, 3e-4, is below the precision). The mixtures (a check of additivity; three calculated) and K are not extracted. The uncertainties are the printed +-, level not stated.

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets#

willetts_1982/measured_He#

{
  "id": "measured_He",
  "material": "He",
  "file": "He/willetts_1982__measured_He.csv",
  "table": "tbl_5618cf9a9efd",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "um",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 103000.0,
    "temperature_c": 19.0
  },
  "density": "ideal",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 2 (a), the pure gas (volumetric ratio 1:0:0): (n - 1) x 10^6 at 10.59 um. A check: its 2.5-6 % uncertainty is far larger than the other data’s.

willetts_1982/measured_N2#

{
  "id": "measured_N2",
  "material": "N2",
  "file": "N2/willetts_1982__measured_N2.csv",
  "table": "tbl_5618cf9a9efd",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "um",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 103000.0,
    "temperature_c": 19.0
  },
  "density": "ideal",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 2 (a), the pure gas (volumetric ratio 0:1:0): (n - 1) x 10^6 at 10.59 um. A check: its 2.5-6 % uncertainty is far larger than the other data’s.

willetts_1982/measured_CO2#

{
  "id": "measured_CO2",
  "material": "CO2",
  "file": "CO2/willetts_1982__measured_CO2.csv",
  "table": "tbl_5618cf9a9efd",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "um",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 103000.0,
    "temperature_c": 19.0
  },
  "density": "ideal",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 2 (a), the pure gas (volumetric ratio 0:0:1): (n - 1) x 10^6 at 10.59 um. A check: its 2.5-6 % uncertainty is far larger than the other data’s.

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.