Formation of NaCl by radiative association in interstellar environments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10452946" target="_blank" >RIV/00216208:11320/22:10452946 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ifYW_0zpUg" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ifYW_0zpUg</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202142965" target="_blank" >10.1051/0004-6361/202142965</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Formation of NaCl by radiative association in interstellar environments

Popis výsledku v původním jazyce

Context. Radiative association is a possible way of sodium chloride (NaCl) formation in interstellar and related environments. Theoretical studies are essential since laboratory experiments are unavailable and difficult to perform. Aims. The total rate coefficient was calculated for the formation of NaCl by radiative association at 30-750 K. Methods. We included two contributing processes for the total rate-coefficient computation. One of them takes the nonadiabatic coupling between the two lowest (1)sigma(+) states, X-1 sigma(+) and Beta(1)sigma(+), into account. The other one was calculated conventionally as a single channel and started in the continuum of the A(1)pi state. The individual rate coefficients were calculated from cross sections obtained up to 0.8 eV, which enabled us to calculate the rate coefficients up to 750 K. The cross section was also calculated for a one-state process within the X-1 sigma(+) state. Results. The nonadiabatic coupling enhances the formation of NaCl by radiative association by two orders of magnitude at about 30 K and by around one order of magnitude at about 750 K. The single-channel process starting in the continuum of the A(1) pi state starts to contribute above around 200 K. The one-state transition model, within the X-1 sigma(+) state, is not an adequate approximation for collisions in (1)sigma(+) symmetry. Instead, these collisions are treated in the diabatic representation in the total rate-coefficient calculation. Conclusions. The calculated total rate-coefficient function at 30-750 K can improve the astrochemical reaction networks for the CRL 2688, IRC+10216, and Orion SrcI environments, where NaCl was detected before.

Název v anglickém jazyce

Formation of NaCl by radiative association in interstellar environments

Popis výsledku anglicky

Context. Radiative association is a possible way of sodium chloride (NaCl) formation in interstellar and related environments. Theoretical studies are essential since laboratory experiments are unavailable and difficult to perform. Aims. The total rate coefficient was calculated for the formation of NaCl by radiative association at 30-750 K. Methods. We included two contributing processes for the total rate-coefficient computation. One of them takes the nonadiabatic coupling between the two lowest (1)sigma(+) states, X-1 sigma(+) and Beta(1)sigma(+), into account. The other one was calculated conventionally as a single channel and started in the continuum of the A(1)pi state. The individual rate coefficients were calculated from cross sections obtained up to 0.8 eV, which enabled us to calculate the rate coefficients up to 750 K. The cross section was also calculated for a one-state process within the X-1 sigma(+) state. Results. The nonadiabatic coupling enhances the formation of NaCl by radiative association by two orders of magnitude at about 30 K and by around one order of magnitude at about 750 K. The single-channel process starting in the continuum of the A(1) pi state starts to contribute above around 200 K. The one-state transition model, within the X-1 sigma(+) state, is not an adequate approximation for collisions in (1)sigma(+) symmetry. Instead, these collisions are treated in the diabatic representation in the total rate-coefficient calculation. Conclusions. The calculated total rate-coefficient function at 30-750 K can improve the astrochemical reaction networks for the CRL 2688, IRC+10216, and Orion SrcI environments, where NaCl was detected before.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

664

Číslo periodika v rámci svazku

August 2022

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

9

Strana od-do

A5

Kód UT WoS článku

000835436000022

EID výsledku v databázi Scopus

2-s2.0-85135621790