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Temperature Dependence of Pressure Broadened Linewidth of J = 1 ⇐ 0 Rotational Transition of CH_{3}C_{14}N Molecule Mixed with OCS and H_{2} Molecule

100%
Gierszal S., Galica J., Miś-Kuźmińska E.
Acta Physica Polonica A
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1995
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vol. 87
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issue 3
585-597
EN
The temperature dependence of the pressure-broadening parameters of the J = 1 ⇐ 0 rotational transition of OCS and H_{2} in the ground vibrational state of CH_{3}C_{14}N molecule is measured in the temperature range between 248 and 293 K. The line shape of the absorption is recorded with a Stark modulated microwave spectrometer. Using least squares fits of the data to the Voigt line function, several contributions to the linewidth have been de­duced. The experimental results are compared with the calculated results us­ing Murphy and Boggs collision broadening theory. The pressure-broadening parameters C_{W}(x) of the gas mixture CH_{3}CN+OCS and CH_{3}CN+H_{2} are 14.05±0.30 MHz/Tr, 9.15±0.12 MHz/Tr, respectively and the temperature dependence parameters α are -0.90 ± 0.07 and -0.77 ± 0.08.
2
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Pressure Broadening Measurements of J=6⇒7 Rotational Line of the t-Butyl Cyanide Molecule

100%
Gierszal S., Galica J., Miś-Kuźmińska E.
Acta Physica Polonica A
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1991
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vol. 79
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issue 4
451-456
EN
Self-broadened width of J = 6⇒7 rotational line in the ground state of t-butyl cyanide molecule has been measured at room temperature. The measurements of the linewidth as a function of the gas pressure were carried out with home-made spectrometer at the frequency ν_{0} = 38 498.308 MHz. The mean value of the pressure-broadening coefficient c = 76.9 ± 0.6 MHz Torr^{-1} was obtained.
3
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Collisional Broadening of the J=7 ⇐ 6 Transition of t-Butyl Cyanide by CH_{3}CN, OCS, CO_{2} and Helium

100%
Gierszal S., Galica J., Miś-Kuźmińska E.
Acta Physica Polonica A
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1992
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vol. 81
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issue 6
613-617
EN
Experimental studies of the broadening of the absorption line J = 6 ⇒ 7 of (CH_{3})_{3}CCN due to collisions with the foreign perturbers He, CO_{2}, OCS, and CH_{3}CN have been carried out. The magnitude of the broadening coefficients reflects the type of interactions occurring in the molecular collisions. It has been concluded that the dipole-dipole and dipole-quadrupole interactions are predominant in the (CH_{3})_{3}CCN admixed with CH_{3}CN and OCS. In the collisions between (CH_{3})_{3}CCN and CO_{2} the dipole-quadrupole interactions are present whereas the He perturbed by (CH_{3})_{3}CCN exhibits dispersive type of interactions.
4
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Pressure Broadening of J=1 ← 0 Rotational Line of Fluoroform Caused by Spherical Perturbers

100%
Gierszal S., Galica J., Miś-Kuźmińska E., Liber A.
Acta Physica Polonica A
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2002
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vol. 101
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issue 6
805-813
EN
The foreign-gas broadening parameter was measured for CHF_3 molecule interacting with spherical (SF_6, CF_4, CH_4, CCl_4) perturbers and the pressure shift parameter of rotational transition J=1 ← 0 in the CHF_3 molecule was obtained. For the systems of trifluoromethane molecule and four spherical molecules as perturbers the collision cross-sections were determined. Experimental line width parameters are interpreted using Anderson-Tsao-Curnutte as well as Murphy-Boggs theories. Accounting for the dispersive and inductive interactions the cross-section was determined. The theoretical values are in qualitative agreement with the experimental results, but the absolute values of the measured cross-section were larger than these calculated.
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