Experimental and theoretical CO2–Ar pressure-broadening cross sections and their temperature dependence

2001 ◽  
Vol 3 (18) ◽  
pp. 3924-3933 ◽  
Author(s):  
F. Thibault ◽  
B. Calil ◽  
J. Buldyreva ◽  
M. Chrysos ◽  
J.-M. Hartmann ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Cross Sections ◽  
Pressure Broadening

Collisional cooling of the NO-He system The pressure broadening cross sections between 4·3 and 1·8 K

1989 ◽  
Vol 67 (2) ◽  
pp. 455-463 ◽  
Author(s):  
Daniel R. Willey ◽  
D.N. Bittner ◽  
Frank C. De Lucia
Keyword(s):  
Cross Sections ◽  
Pressure Broadening ◽  
Collisional Cooling

Temperature Dependence of N2-Relaxation of Rotational Lines of Propionitrile

1992 ◽  
Vol 47 (9) ◽  
pp. 999-1002 ◽  
Author(s):  
H.-W. Nicolaisen ◽  
H. Mäder ◽  
F. Rohart
Keyword(s):  
Temperature Dependence ◽  
Pressure Dependence ◽  
Decay Rates ◽  
Rotational Relaxation ◽  
Pressure Broadening ◽  
Ambient Temperatures

AbstractThe temperature dependence of the rotational relaxation of propionitrile, CH3CH2C15N, has been investigated by means of microwave transient emission signals. From analysis of the pressure dependence of the coherence decay rates for the rotational lines (J, K-, K+) = (2, 0, 2)-(3, 0, 3), (2,1, 2)-(3, 1, 3), and (2, 2, l)-(3, 2, 2) pressure broadening parameters have been derived for mixtures with nitrogen in the 210-300 K range and for the pure gas at ambient temperatures

scholarly journals Molecular cross-sections for high-resolution spectroscopy of super-Earths, warm Neptunes, and hot Jupiters

2020 ◽  
Vol 495 (1) ◽  
pp. 224-237 ◽  
Author(s):  
Siddharth Gandhi ◽  
Matteo Brogi ◽  
Sergei N Yurchenko ◽  
Jonathan Tennyson ◽  
Phillip A Coles ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Cross Correlation ◽  
High Resolution Spectroscopy ◽  
High Signal ◽  
Pressure Broadening ◽  
Spectral Signatures ◽  
Hot Jupiters ◽  
Wide Range ◽  
Infrared Spectral

ABSTRACT High-resolution spectroscopy (HRS) has been used to detect a number of species in the atmospheres of hot Jupiters. Key to such detections is accurately and precisely modelled spectra for cross-correlation against the R ≳ 20 000 observations. There is a need for the latest generation of opacities which form the basis for high signal-to-noise detections using such spectra. In this study we present and make publicly available cross-sections for six molecular species, H2O, CO, HCN, CH4, NH3, and CO2 using the latest line lists most suitable for low- and high-resolution spectroscopy. We focus on the infrared (0.95–5 μm) and between 500 and 1500 K where these species have strong spectral signatures. We generate these cross-sections on a grid of pressures and temperatures typical for the photospheres of super-Earth, warm Neptunes, and hot Jupiters using the latest H2 and He pressure broadening. We highlight the most prominent infrared spectral features by modelling three representative exoplanets, GJ 1214 b, GJ 3470 b, and HD 189733 b, which encompass a wide range in temperature, mass, and radii. In addition, we verify the line lists for H2O, CO, and HCN with previous high-resolution observations of hot Jupiters. However, we are unable to detect CH4 with our new cross-sections from HRS observations of HD 102195 b. These high-accuracy opacities are critical for atmospheric detections with HRS and will be continually updated as new data become available.

Pressure Effects of Foreign Gases on the 535.0 nm Fluorescence Line of Thallium

1985 ◽  
Vol 40 (8) ◽  
pp. 800-809 ◽  
Author(s):  
E. Lisicki ◽  
A. Bielski ◽  
J. Szudy ◽  
J. Wolnikowski
Keyword(s):  
Cross Sections ◽  
Pressure Effects ◽  
Pressure Broadening ◽  
Fluorescence Line ◽  
Series Of Experiments ◽  
The Cross ◽  
The Impact

Results of a series of experiments on pressure effects caused by various foreign gases on the 535.0 nm Tl fluorescence line emitted due to the photodissociation of TlI-molecules are summarized and some aspects of the Doppler and pressure broadening of this line are discussed. The impact broadening- and shift-cross sections are determined for two sets of mean relative velocities ū of the emitter-perturber pair. An attempt is made to analyse the cross-sections for different perturbers by investigating their dependence on the quantity (α/ū)2/5, where α is the polarizability of the perturber.

Temperature dependence of cross sections for 72P1/2 ↔ 72P3/2 excitation transfer and for quenching in cesium, induced in collisions with H2, N2, CH4, and CD4

1982 ◽  
Vol 60 (2) ◽  
pp. 239-244 ◽  
Author(s):  
I. N. Siara ◽  
R. U. Dubois ◽  
L. Krause
Keyword(s):  
Energy Transfer ◽  
Temperature Dependence ◽  
Cross Sections ◽  
Rotational Energy ◽  
Excitation Transfer ◽  
Sensitized Fluorescence ◽  
Temperature Range ◽  
Rotational Energy Transfer ◽  
Order Of Magnitude

The temperature dependence of cross sections for 72P1/2 ↔ 72P3/2 excitation transfer in cesium, as well as the effective quenching of these states, induced in collisions with H2, N2, CH4, and CD4 molecules have been investigated in a series of sensitized fluorescence experiments over a temperature range 390–640 K. The 72P mixing cross sections are of the order of 10−15 cm2 and exceed by at least one order of magnitude similar cross sections for mixing by collisions with Ne, Ar, Kr, and Xe. The large sizes of the mixing cross sections and their variation with temperature are ascribed to a phenomenon of electronic-to-rotational energy transfer.

Experimental and theoretical CO2–He pressure broadening cross sections

2000 ◽  
Vol 2 (23) ◽  
pp. 5404-5410 ◽  
Author(s):  
F. Thibault ◽  
B. Calil ◽  
J. Boissoles ◽  
J. M. Launay
Keyword(s):  
Cross Sections ◽  
Pressure Broadening
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