vukovic_1996#

D. Vukovic, G. A. Woolsey and G. B. Scelsi, J. Phys. D: Appl. Phys. 29, 634 (1996)

Source record · Catalogue · Review register

Source kind: measurement

Recorded technique: Lee-Woolsey polarization interferometer (prisms only), gas in a thermally insulated invar tube of internal length 486.42 mm, He-Ne laser at 632.99 nm or a 1300 nm laser diode (wavelength known to 0.03 %). Fringe shift (to 0.01 fringe at 632.99 nm, 0.05 at 1300 nm; over 100 fringes in total) recorded against pressure (Vaisala PTB200, to 15 Pa) from 60 to 110 kPa on filling and on pumping out, at 20-25 degrees C (to 0.1 K); n - 1 = A (p/RT) + B(T) (p/RT)^2 (Eq. 3) fitted (pp. 3-4). SF6 99.9 % pure.

Materials in structured entries: SF6

Dataset quantities: molar_refractivity, refractivity, refractivity_virial_coefficient

Contents: 8 datasets; 2 formulas.

Curation notes#

n - 1 = m lambda0 / L (Eq. 6), lambda0 the vacuum wavelength: the wavelengths are vacuum (632.99 nm He-Ne; 1300 nm nominal). The refractivity ‘at 101 325 Pa’ at the measurement temperature and the value ‘converted to 25 degrees C and 1 atm’ with Eq. (3) (B(T) held constant, an error of 2.5e-7, p. 4) refer to the real gas at that pressure and temperature: density real. A_R = 2 A / 3 (Eq. 4) is the first refractivity virial coefficient (the package’s molar refractivity; 10^-6 m^3/mol = cm^3/mol).

Which values are independent: all three (refractivity at T, at 25 C, and A_R) come from one fit per wavelength. The 25 C refractivities are taken as primary: they are the paper’s comparison values and agree with Eq. (3) and the printed A and B (632.99 nm: 703.00 against 702.96; 1300 nm: 693.8 against 694.0). The values at the measurement temperature and A_R are checks. The 1300 nm value ‘at 21.8 C’, 698.7, is inconsistent with the printed A and B at 21.8 C (they give 701.4) but consistent with them at 22.9 C (698.75), the temperature of the 632.99 nm measurement; either the temperature or the value is misprinted, which cannot be decided, so no correction is made (that dataset is a check).

Uncertainty (p. 4-5): ‘the interferometric contributions to uncertainties are less than 0.01% and 0.05%’; the laser-diode wavelength 0.03 %; tube length 0.01 %; pressure 0.03 %; temperature 0.03 %; the tabulated +- (level not stated) are 0.5 and 1 x 10^-6. B(T) is uncertain ‘as high as 100%’ and not used here. B_R is not given for this work (it depends on B_p, which varies by more than 10 % between authors).

Table 3 compares SF6 at 632.99 nm with Buckingham and Graham (1974), Watson and Ramaswamy (1936, curated as watson_1936; 699.39 at 644.024 nm, an ideal-gas value, compared here with a real-gas one) and St-Arnaud and Bose (1979). Their A_R and B_R are extracted as reproduced values; the same values are reproduced by achtermann_1991 (which prints Buckingham and Graham’s B_R as 29 +- 5, here 29 +- 3). Table 3’s A_R header reads 10^-5 m^3/mol, a misprint for 10^-6 (the values are Table 1’s). The refractivity 704.005 and A 1.701, 1.7022 ‘calculated’ by the authors from others’ A_R, B_R with Hamann et al.’s B_p = -284.45e-6 m^3/mol are derived and not extracted.

Thionyl fluoride (SOF2) is not a curated species and is skipped.

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

Datasets#

vukovic_1996/refractivity_25C#

{
  "id": "refractivity_25C",
  "material": "SF6",
  "file": "SF6/vukovic_1996__refractivity_25C.csv",
  "table": "tbl_dc762adbe049",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 101325.0,
    "temperature_c": 25.0
  },
  "density": "real",
  "use": "primary",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Tables 1 (632.99 nm) and 2 (1300 nm, tbl_786fca828745), refractivity x 10^6 at 25 C and 101 325 Pa, converted from the measurement temperature with Eq. (3).

vukovic_1996/measured_632#

{
  "id": "measured_632",
  "material": "SF6",
  "file": "SF6/vukovic_1996__measured_632.csv",
  "table": "tbl_dc762adbe049",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 101325.0,
    "temperature_c": 22.9
  },
  "density": "real",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 1, refractivity at 101 325 Pa and the measurement temperature 22.9 C (the same fit as refractivity_25C).

vukovic_1996/measured_1300#

{
  "id": "measured_1300",
  "material": "SF6",
  "file": "SF6/vukovic_1996__measured_1300.csv",
  "table": "tbl_786fca828745",
  "quantity": "refractivity",
  "scale": 1e-06,
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "state": {
    "pressure_pa": 101325.0,
    "temperature_c": 21.8
  },
  "density": "real",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 2, refractivity at 101 325 Pa ‘at 21.8 C’; inconsistent with the printed A and B at 21.8 C by 2.7e-6 (source notes).

vukovic_1996/A_R#

{
  "id": "A_R",
  "material": "SF6",
  "file": "SF6/vukovic_1996__A_R.csv",
  "table": "tbl_dc762adbe049",
  "quantity": "molar_refractivity",
  "unit": "cm3/mol",
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Tables 1 and 2, A_R = 2A/3 (10^-6 m^3/mol) from the same fits as the refractivities. At 1300 nm 2A/3 = 11.173 against the printed 11.18 (A printed to four figures).

vukovic_1996/buckingham_graham_A_R#

{
  "id": "buckingham_graham_A_R",
  "material": "SF6",
  "file": "SF6/vukovic_1996__buckingham_graham_A_R.csv",
  "table": "tbl_d5adcde5ec76",
  "quantity": "molar_refractivity",
  "unit": "cm3/mol",
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "use": "reproduced",
  "reproduced_from": [
    "A. D. Buckingham and C. Graham, Proc. R. Soc. A 337, 275 (1974)"
  ]
}

Table 3, A_R (printed header 10^-5, values 10^-6 m^3/mol); wavelength not stated, taken as the table’s 632.99 nm. Also reproduced by achtermann_1991 (A_R_buckingham_graham_1974_SF6).

vukovic_1996/buckingham_graham_B_R#

{
  "id": "buckingham_graham_B_R",
  "material": "SF6",
  "file": "SF6/vukovic_1996__buckingham_graham_B_R.csv",
  "table": "tbl_d5adcde5ec76",
  "quantity": "refractivity_virial_coefficient",
  "unit": "cm6/mol2",
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "use": "reproduced",
  "reproduced_from": [
    "A. D. Buckingham and C. Graham, Proc. R. Soc. A 337, 275 (1974)"
  ],
  "uncertainty": {
    "column": true,
    "level": "not stated"
  },
  "parameters": {
    "temperature_k": 299.0
  }
}

Table 3, B_R = 29 +- 3 (10^-12 m^6/mol^2 = cm^6/mol^2) at 299 K; achtermann_1991 prints the same value as 29 +- 5.

vukovic_1996/st_arnaud_bose_A_R#

{
  "id": "st_arnaud_bose_A_R",
  "material": "SF6",
  "file": "SF6/vukovic_1996__st_arnaud_bose_A_R.csv",
  "table": "tbl_d5adcde5ec76",
  "quantity": "molar_refractivity",
  "unit": "cm3/mol",
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "use": "reproduced",
  "reproduced_from": [
    "J. M. St-Arnaud and T. K. Bose, J. Chem. Phys. 71, 4951 (1979)"
  ],
  "uncertainty": {
    "column": true,
    "level": "not stated"
  }
}

Table 3, A_R at 323 K (header misprinted 10^-5). Also reproduced by achtermann_1991.

vukovic_1996/st_arnaud_bose_B_R#

{
  "id": "st_arnaud_bose_B_R",
  "material": "SF6",
  "file": "SF6/vukovic_1996__st_arnaud_bose_B_R.csv",
  "table": "tbl_d5adcde5ec76",
  "quantity": "refractivity_virial_coefficient",
  "unit": "cm6/mol2",
  "abscissa_unit": "nm",
  "wavelength_medium": "vacuum",
  "use": "reproduced",
  "reproduced_from": [
    "J. M. St-Arnaud and T. K. Bose, J. Chem. Phys. 71, 4951 (1979)"
  ],
  "uncertainty": {
    "column": true,
    "level": "not stated"
  },
  "parameters": {
    "temperature_k": 323.0
  }
}

Table 3, B_R = 36 +- 1.8 cm^6/mol^2 at 323 K. Also reproduced by achtermann_1991.

Formulas#

vukovic_1996/virial_632#

{
  "id": "virial_632",
  "material": "SF6",
  "equation": "Eq. (3), p. 3, with Table 1, p. 4",
  "printed": "n - 1 = A (p/RT) + B(T) (p/RT)^2; A = 1.7005 +- 0.0012 x 10^-5 m^3/mol, B = 47.3 x 10^-10 m^6/mol^2 at 22.9 C",
  "variable": "p in Pa, T in K, R the gas constant; lambda = 632.99 nm (vacuum)",
  "density": "real",
  "range": "632.99 nm; 60-110 kPa, 20-25 C",
  "coefficients": {
    "A": "1.7005e-5",
    "B": "47.3e-10"
  },
  "check": "With R = 8.314 J/(mol K) it gives 708.05e-6 at 101 325 Pa and 22.9 C (printed 708.05) and 703.00e-6 at 25 C (printed 702.96). Checked 2026-09-25."
}

A density expansion at one wavelength, not a dispersion formula. B is uncertain ‘as high as 100%’ (p. 5).

vukovic_1996/virial_1300#

{
  "id": "virial_1300",
  "material": "SF6",
  "equation": "Eq. (3), p. 3, with Table 2, p. 4",
  "printed": "n - 1 = A (p/RT) + B(T) (p/RT)^2; A = 1.676 +- 0.0024 x 10^-5 m^3/mol, B = 52 x 10^-10 m^6/mol^2 at 21.8 C",
  "variable": "p in Pa, T in K; lambda = 1300 nm",
  "density": "real",
  "range": "1300 nm; 60-110 kPa, 20-25 C",
  "coefficients": {
    "A": "1.676e-5",
    "B": "52e-10"
  },
  "check": "Gives 693.8e-6 at 25 C (printed 694.0) but 701.4e-6 at 21.8 C against the printed 698.7 (698.75 at 22.9 C). Checked 2026-09-25."
}

See the source notes on the 21.8 C value.

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.