Analysis of the Line Profiles of CH3CN for theJ= 5 ← 4 andJ= 6 ← 5 Rotational Transitions

K-Dependence and temperature dependence of N2-, H2-, and He-broadening coefficients for the J=12–11 transition of acetonitrile CH3C14N located near 220.7GHz

“…Previous works on the K-dependence of the collisionalbroadening parameters have been performed in the milli- meter/sub-millimeter-wave range on the CH 3 CN molecule [15][16][17][18]42], and in the infrared region on CH 3 Cl [12], CH 3 D [10] and on CH 3 F [11]. Let us mention Leavitt's work [43] that includes an extensive discussion based on theoretical collisional broadening calculations.…”

“…[16] for low J rotational transition. Fabian et al determined for the same molecule the self-and foreign-broadening coefficients for the buffer gases N 2 , O 2 , and Ar, for all the K-components of the J = 5-4 and J = 6-5 transitions [17]. In these papers, the K-dependence of the collisional broadening is not clearly established, although a tendency to decrease with increasing K, can be observed.…”

New Millimeter Heterodyne Observations of Titan: Vertical Distributions of Nitriles HCN, HC3N, CH3CN, and the Isotopic Ratio 15N/14N in Its Atmosphere

“…When the measured values were not available (i.e., for HC 3 N), we utilized theoretical values outlined in the corresponding references. We also ignored a possible dependence of the CH 3 CN broadening coefficient with the quantum numbers (J, K ), which was estimated by Fabian et al (1998), but for low-J transitions.…”

Absorption profiles of HCl for the J=1–0 rotational transition: Foreign-gas effects measured for N2, O2, and Ar

“…The absorption line profiles have been recorded in the present study by the AIST terahertz spectrometer [2,26,27] using a backward-wave oscillator (BWO, IS-TOK OV-80, Russia) as a radiation source. The frequency of the BWO is controlled by a millimeter-wave (mmW) synthesizer (KVARZ, Russia) oscillating around 100 GHz as a local oscillator, with a phaselock-loop (PLL) using an intermediate frequency of 350 MHz generated by a harmonics mixer, which mixes the mmW synthesizer and the BWO radiations.…”

“…Although a number of data for infrared spectra have been published and accumulated as databases such as the HITRAN database (http:// cfa-www.Harvard.edu/HITRAN/), the reliable data in millimeter and terahertz region are limited so far because of technical difficulties. We have, therefore, concentrated our effort in these years on developing the precise measurement and analysis techniques in order to supply accurate profile parameters and pressure coefficients of molecules of interest in the atmospheric environment [1][2][3]. In the present study, we have measured the line profiles of the J = 1-0 transition of the hydrogen chloride, H 35 Cl and H 37 Cl.…”