Decomposition of HCN during Experimental Impacts in Dry and Wet Planetary Atmospheres

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F24%3A00586720" target="_blank" >RIV/61388955:_____/24:00586720 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/24:10484594

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acsearthspacechem.4c00064" target="_blank" >https://pubs.acs.org/doi/10.1021/acsearthspacechem.4c00064</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsearthspacechem.4c00064" target="_blank" >10.1021/acsearthspacechem.4c00064</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Decomposition of HCN during Experimental Impacts in Dry and Wet Planetary Atmospheres

Popis výsledku v původním jazyce

Hydrogen cyanide (HCN), a key molecule of significant importance in contemporary perspectives on prebiotic chemistry, originates in planetary atmospheres from various processes, such as photochemistry, thermochemistry, and impact chemistry, as well as from delivery by impacts. The resilience of HCN during periods of heavy bombardment, a phenomenon caused by an influx of material on unstable trajectories after accretion, remains relatively understudied. This study extensively investigates the stability of HCN under impact conditions simulated using a laboratory Nd:YAG laser in the ELISE experimental setup. High-resolution infrared spectroscopy was employed to monitor the gas phase composition during these simulations. Impact chemistry was simulated in bulk nitrogen atmospheres with varying mixing ratios of HCN and water vapor. The probed range of compositions spans from similar to 0 to 1.8% of HCN and 0 to 2.7% of H2O in a similar to 1 bar nitrogen atmosphere. The primary decomposition products of HCN are CO and CO2 in the presence of water and unidentified solid phase products in dry conditions. Our experiments revealed a range of initial HCN decomposition rates between 2.43 x 10(15) and 5.17 x 10(17) molec J(-1) of input energy depending on the initial composition. Notably, it is shown that the decomposition process induced by the laser spark simulating the impact plasma is nonlinear, with the duration of the irradiation markedly affecting the decomposition rate. These findings underscore the necessity for careful consideration and allowance for margins when applying these rates to chemical models of molecular synthesis and decomposition in planetary atmospheres.

Název v anglickém jazyce

Decomposition of HCN during Experimental Impacts in Dry and Wet Planetary Atmospheres

Popis výsledku anglicky

Hydrogen cyanide (HCN), a key molecule of significant importance in contemporary perspectives on prebiotic chemistry, originates in planetary atmospheres from various processes, such as photochemistry, thermochemistry, and impact chemistry, as well as from delivery by impacts. The resilience of HCN during periods of heavy bombardment, a phenomenon caused by an influx of material on unstable trajectories after accretion, remains relatively understudied. This study extensively investigates the stability of HCN under impact conditions simulated using a laboratory Nd:YAG laser in the ELISE experimental setup. High-resolution infrared spectroscopy was employed to monitor the gas phase composition during these simulations. Impact chemistry was simulated in bulk nitrogen atmospheres with varying mixing ratios of HCN and water vapor. The probed range of compositions spans from similar to 0 to 1.8% of HCN and 0 to 2.7% of H2O in a similar to 1 bar nitrogen atmosphere. The primary decomposition products of HCN are CO and CO2 in the presence of water and unidentified solid phase products in dry conditions. Our experiments revealed a range of initial HCN decomposition rates between 2.43 x 10(15) and 5.17 x 10(17) molec J(-1) of input energy depending on the initial composition. Notably, it is shown that the decomposition process induced by the laser spark simulating the impact plasma is nonlinear, with the duration of the irradiation markedly affecting the decomposition rate. These findings underscore the necessity for careful consideration and allowance for margins when applying these rates to chemical models of molecular synthesis and decomposition in planetary atmospheres.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

ACS Earth and Space Chemistry

ISSN

2472-3452

e-ISSN

2472-3452

Svazek periodika

8

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

1246-1258

Kód UT WoS článku

001231811600001

EID výsledku v databázi Scopus

2-s2.0-85194234793