New insight on ammonia 1.5 µm overtone spectra from two-temperature analysis in supersonic jet

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00511924" target="_blank" >RIV/61388955:_____/19:00511924 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0302157" target="_blank" >http://hdl.handle.net/11104/0302157</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jqsrt.2019.01.030" target="_blank" >10.1016/j.jqsrt.2019.01.030</a>

Result language

angličtina

Original language name

New insight on ammonia 1.5 µm overtone spectra from two-temperature analysis in supersonic jet

Original language description

The paper presents new high-resolution spectroscopic data for the 1.5 mu m region of ammonia. All measurements have been taken in the slit-jet supersonic expansion leading to effective rotational cooling and thus facilitating significant simplification of the spectra. We demonstrate the method of controlling the expansion temperature by changing the ammonia concentration and total stagnation pressure in the jet. This allows recording spectra at 20 K and 80 K, respectively. We demonstrate two-temperature technique based on line intensity analysis using those jet spectra, that proves very effective in determining the lower state energies for states with J '' = 0, 1, and 2. The transitions originating from such states are especially important for the identification of vibrational band origins and a critical evaluation of the accuracy of the latest theoretical calculations. Empirical rotational assignments were performed for 46 ro-vibrational transitions between 6500 cm(-1) and 6900 cm(-1), respectively. Seven lines have been identified as R(0) transitions with J '' = K '' = 0, four of which are first-time identifications and/or corrections of previous misassignments. The assignments were then reconfirmed using the R(0) P(2) ground state combination differences. Additional corresponding P(1) transitions terminating in the J' = K' = 0 upper level were found. These point straight to the vibrational band origins. Altogether, band origins for 7 vibrations have been determined and the corresponding R(0), P(1) and P(2) lines have been assigned. Finally, the experimental data are compared to highly-accurate theoretical predictions for ammonia in this spectral range. (C) 2019 Elsevier Ltd. All rights reserved.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA13-11635S" target="_blank" >GA13-11635S: Vibrational overtone driven atmospheric chemistry in isolated molecules and molecular clusters.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Quantitative Spectroscopy and Radiative Transfer

ISSN

0022-4073

e-ISSN

—

Volume of the periodical

227

Issue of the periodical within the volume

APR 2019

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

201-210

UT code for WoS article

000462803700022

EID of the result in the Scopus database

2-s2.0-85061744942