Manfred Birk, Dieter Hausamann, Georg Wagner, and John W. Johns, "Determination of line strengths by Fourier-transform
spectroscopy," Appl. Opt. 35, 2971-2985 (1996)
A rigorous test of the photometric accuracy of commercial high-resolution Fourier
transform spectrometers has been made by measuring line strengths in the pure
rotational spectrum of carbon monoxide. Measurements have been made with a Bruker IFS
120 HR spectrometer (transitions: J″ = 7 …
23) and a Bomen DA3.002 spectrometer (J″ = 27
… 35). A least-squares fit of individual data sets and the combined data gave
permanent electric dipole moments in the range 0.1091–0.1101 D and quadratic
Herman–Wallis factors in the range −0.188 to −0.229 ×
10−3, in good agreement with literature values within the
overall uncertainty. Sources of systematic errors in the Fourier-transform
spectrometer and in the algorithms used to reduce the data are discussed in detail.
The experimental results show that such errors affected the retrieved line strengths
by less than 1%.
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
To convert to the units (cm−2/atm) used in Eqs. (1) and (A1) the line strengths have to be multiplied
by 1.01325/(10 kT). T = 296.0 K, p = 20.03 hPa,
l = 13.271 cm. T = 296.7 K, p = 40.02 hPa,
l = 6.241 cm. T = 296.4 K, p = 40.06 hPa,
l = 13.271 cm. T = 294.5 K, p = 0.0204 hPa,
l = 7231.1 cm.
Table 3
Experimental Line Strengths for CO: Bomem Measurementsa
To convert to the units (cm−2/atm) used in Eqs. (1) and (A1) the line strengths have to be multiplied
by 1.01325/(10 kT). T = 296.0 K, p = 10.0 Torr,
l = 621.2 cm. T = 296.0 K, p = 30.8 Torr,
l = 621.2 cm. T = 296.0 K, p = 100.5 Torr,
l = 621.2 cm.
Table 4
Permanent Electric Dipole Moments and Quadratic HWF’s as Obtained from
Least-Squares Fits of Experimental Line Strengthsa
Meas.
μ00/D
D/10−3
I
0.10945(22)
−0.222(12)
II
0.10976(21)
−0.218(14)
III
0.10954(20)
−0.229(12)
IV
0.10951(30)
−0.188(18)
Theor.
0.10980(3)
−0.208
The Quartic HWF was fixed to its theoretical value.
Table 5
Permanent Electric Dipole Moments and Temperatures as Obtained from Least-Squares
Fits of Experimental Line Strengthsa
Meas.
μ00/D
Tgas/K
Tcell/K
I
0.109328(97)
295.61(44)
296.0(2)
II
0.109549(82)
296.44(51)
296.7(2)
III
0.109242(77)
295.75(42)
296.4(2)
IV
0.110069(115)
295.32(64)
294.4(10)
Quadratic and quartic HWF’s were fixed to their theoretical values.
Table 6
CO: Molecular Constants, Coordinates, and Transformation Factors
To convert to the units (cm−2/atm) used in Eqs. (1) and (A1) the line strengths have to be multiplied
by 1.01325/(10 kT). T = 296.0 K, p = 20.03 hPa,
l = 13.271 cm. T = 296.7 K, p = 40.02 hPa,
l = 6.241 cm. T = 296.4 K, p = 40.06 hPa,
l = 13.271 cm. T = 294.5 K, p = 0.0204 hPa,
l = 7231.1 cm.
Table 3
Experimental Line Strengths for CO: Bomem Measurementsa
To convert to the units (cm−2/atm) used in Eqs. (1) and (A1) the line strengths have to be multiplied
by 1.01325/(10 kT). T = 296.0 K, p = 10.0 Torr,
l = 621.2 cm. T = 296.0 K, p = 30.8 Torr,
l = 621.2 cm. T = 296.0 K, p = 100.5 Torr,
l = 621.2 cm.
Table 4
Permanent Electric Dipole Moments and Quadratic HWF’s as Obtained from
Least-Squares Fits of Experimental Line Strengthsa
Meas.
μ00/D
D/10−3
I
0.10945(22)
−0.222(12)
II
0.10976(21)
−0.218(14)
III
0.10954(20)
−0.229(12)
IV
0.10951(30)
−0.188(18)
Theor.
0.10980(3)
−0.208
The Quartic HWF was fixed to its theoretical value.
Table 5
Permanent Electric Dipole Moments and Temperatures as Obtained from Least-Squares
Fits of Experimental Line Strengthsa
Meas.
μ00/D
Tgas/K
Tcell/K
I
0.109328(97)
295.61(44)
296.0(2)
II
0.109549(82)
296.44(51)
296.7(2)
III
0.109242(77)
295.75(42)
296.4(2)
IV
0.110069(115)
295.32(64)
294.4(10)
Quadratic and quartic HWF’s were fixed to their theoretical values.
Table 6
CO: Molecular Constants, Coordinates, and Transformation Factors