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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA13-11635S" target="_blank" >GA13-11635S: Vibračními overtony iniciovaná atmosferická chemie izolovaných molekul a molekulárních klastrů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Quantitative Spectroscopy and Radiative Transfer

ISSN

0022-4073

e-ISSN

—

Svazek periodika

227

Číslo periodika v rámci svazku

APR 2019

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

201-210

Kód UT WoS článku

000462803700022

EID výsledku v databázi Scopus

2-s2.0-85061744942