Studies of inelastic molecular collisions using impact parameter methods. III. Line shape functions

1975 ◽  
Vol 63 (4) ◽  
pp. 1547-1554 ◽  
Author(s):  
Georgia Fisanick‐Englot ◽  
Herschel Rabitz
Keyword(s):  
Impact Parameter ◽  
Line Shape ◽  
Shape Functions ◽  
Molecular Collisions

Generalized Impact-Parameter Method for Low-Energy Molecular Collisions

1971 ◽  
Vol 4 (3) ◽  
pp. 977-984 ◽  
Author(s):  
B. Corrigall ◽  
B. Kuppers ◽  
R. Wallace
Keyword(s):  
Impact Parameter ◽  
Low Energy ◽  
Parameter Method ◽  
Molecular Collisions

scholarly journals ZEST: A Fast Code for Simulating Zeeman-Stark Line-Shape Functions

Atoms ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 11 ◽  
Author(s):  
Franck Gilleron ◽  
Jean-Christophe Pain
Keyword(s):  
Line Shape ◽  
Shape Functions

scholarly journals Characterization of the OCO-2 instrument line shape functions using on-orbit solar measurements

2016 ◽  
Author(s):  
Kang Sun ◽  
Xiong Liu ◽  
Caroline R. Nowlan ◽  
Zhaonan Cai ◽  
Kelly Chance ◽  
...  
Keyword(s):  
Line Shape ◽  
High Spectral Resolution ◽  
Reference Spectrum ◽  
Shape Functions ◽  
Retrieval Accuracy ◽  
Analytical Functions ◽  
Sampling Position ◽  
Spectral Sampling ◽  
Spurious Signals

Abstract. Accurately characterizing the instrument line shape (ILS) of the Orbiting Carbon Observatory-2 (OCO-2) is challenging and highly important due to its high spectral resolution and requirement for retrieval accuracy (0.25 %) compared to previous space-borne grating spectrometers. On-orbit ILS functions for all three bands of the OCO-2 instrument have been derived using its frequent solar measurements and high-resolution solar reference spectra. The solar reference spectrum generated from the 2016 version of the TCCON solar line list shows significant improvements in the fitting residual compared to the solar reference spectrum currently used in the v7 L2 algorithm in the O2 A band. The analytical functions used to represent the ILS of previous grating spectrometers are found to be inadequate for the OCO-2 ILS. Particularly, the hybrid Gaussian and Super Gaussian functions may introduce spurious variations, up to 5 % of the ILS width, depending on the spectral sampling position, when there is a spectral undersampling. Fitting a homogeneous stretch of the preflight ILS together with the relative widening of the wings of the ILS is insensitive to the sampling grid position and accurately captures the variation of ILS in the O2 A band between decontamination events. These temporal changes of ILS may explain the spurious signals observed in the solar-induce fluorescence retrieval in barren areas.

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