Reaction of NH+, NH2+, and NH3+ ions with H-2 at low temperatures The pathway to ammonia production in the interstellar medium

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10395967" target="_blank" >RIV/00216208:11320/19:10395967 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=THnSZc8DeG" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=THnSZc8DeG</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201834149" target="_blank" >10.1051/0004-6361/201834149</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Reaction of NH+, NH2+, and NH3+ ions with H-2 at low temperatures The pathway to ammonia production in the interstellar medium

Popis výsledku v původním jazyce

Aims. We present an experimental investigation of the exothermic reactions of NH+, NH2+, and NH3+ ions with H-2 at temperatures relevant for interstellar clouds. Methods. The reactions were studied using a variable-temperature 22-pole radio frequency ion trap instrument. Results. The temperature dependences of rate coefficients of these reactions have been obtained at temperatures from 15 up to 300 K. The reaction of NH+ with H-2 has two channels, which lead to NH2+ (similar to 97%) and H-3(+)(similar to 3%) with nearly constant reaction rate coefficients (k(NH+)(a) (17 K) = 1.0 x 10(-9) cm(3) s(-1) and k(NH+)(b) (17 K) = 4.0 x 10(-11) cm(3) s(-1), respectively). The reaction of NH2+ with H-2 produces only NH3+ ions. The measured rate coefficient monotonically decreases with increasing temperature from k(NH+2) (17 K) = 6 x 10(-10) cm(3) s(-1) to k(NH +2) (300 K) = 2 x 10(-10) cm(3) s(-1). The measured rate coefficient of the reaction of NH3+ with H-2, producing NH4+, increases with decreasing temperature from 80K down to 15 K, confirming that the reaction proceeds by tunnelling through a potential barrier.

Název v anglickém jazyce

Reaction of NH+, NH2+, and NH3+ ions with H-2 at low temperatures The pathway to ammonia production in the interstellar medium

Popis výsledku anglicky

Aims. We present an experimental investigation of the exothermic reactions of NH+, NH2+, and NH3+ ions with H-2 at temperatures relevant for interstellar clouds. Methods. The reactions were studied using a variable-temperature 22-pole radio frequency ion trap instrument. Results. The temperature dependences of rate coefficients of these reactions have been obtained at temperatures from 15 up to 300 K. The reaction of NH+ with H-2 has two channels, which lead to NH2+ (similar to 97%) and H-3(+)(similar to 3%) with nearly constant reaction rate coefficients (k(NH+)(a) (17 K) = 1.0 x 10(-9) cm(3) s(-1) and k(NH+)(b) (17 K) = 4.0 x 10(-11) cm(3) s(-1), respectively). The reaction of NH2+ with H-2 produces only NH3+ ions. The measured rate coefficient monotonically decreases with increasing temperature from k(NH+2) (17 K) = 6 x 10(-10) cm(3) s(-1) to k(NH +2) (300 K) = 2 x 10(-10) cm(3) s(-1). The measured rate coefficient of the reaction of NH3+ with H-2, producing NH4+, increases with decreasing temperature from 80K down to 15 K, confirming that the reaction proceeds by tunnelling through a potential barrier.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

625

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

8

Strana od-do

A74

Kód UT WoS článku

000468015700003

EID výsledku v databázi Scopus

2-s2.0-85071235213