A Novel Abiotic Pathway for Phosphine Synthesis over Acidic Dust in Venus' Atmosphere

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F24%3A00586724" target="_blank" >RIV/61388955:_____/24:00586724 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/24:10480934

Výsledek na webu

<a href="https://www.liebertpub.com/doi/10.1089/ast.2023.0046" target="_blank" >https://www.liebertpub.com/doi/10.1089/ast.2023.0046</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1089/ast.2023.0046" target="_blank" >10.1089/ast.2023.0046</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A Novel Abiotic Pathway for Phosphine Synthesis over Acidic Dust in Venus' Atmosphere

Popis výsledku v původním jazyce

Recent ground-based observations of Venus have detected a single spectral feature consistent with phosphine (PH3) in the middle atmosphere, a gas which has been suggested as a biosignature on rocky planets. The presence of PH3 in the oxidized atmosphere of Venus has not yet been explained by any abiotic process. However, state-of-the-art experimental and theoretical research published in previous works demonstrated a photochemical origin of another potential biosignature-the hydride methane-from carbon dioxide over acidic mineral surfaces on Mars. The production of methane includes formation of the HC center dot O radical. Our density functional theory (DFT) calculations predict an energetically plausible reaction network leading to PH3, involving either HC center dot O or H center dot radicals. We suggest that, similarly to the photochemical formation of methane over acidic minerals already discussed for Mars, the origin of PH3 in Venus' atmosphere could be explained by radical chemistry starting with the reaction of center dot PO with HC center dot O, the latter being produced by reduction of CO2 over acidic dust in upper atmospheric layers of Venus by ultraviolet radiation. HPO, H2P center dot O, and H3P center dot OH have been identified as key intermediate species in our model pathway for phosphine synthesis.

Název v anglickém jazyce

A Novel Abiotic Pathway for Phosphine Synthesis over Acidic Dust in Venus' Atmosphere

Popis výsledku anglicky

Recent ground-based observations of Venus have detected a single spectral feature consistent with phosphine (PH3) in the middle atmosphere, a gas which has been suggested as a biosignature on rocky planets. The presence of PH3 in the oxidized atmosphere of Venus has not yet been explained by any abiotic process. However, state-of-the-art experimental and theoretical research published in previous works demonstrated a photochemical origin of another potential biosignature-the hydride methane-from carbon dioxide over acidic mineral surfaces on Mars. The production of methane includes formation of the HC center dot O radical. Our density functional theory (DFT) calculations predict an energetically plausible reaction network leading to PH3, involving either HC center dot O or H center dot radicals. We suggest that, similarly to the photochemical formation of methane over acidic minerals already discussed for Mars, the origin of PH3 in Venus' atmosphere could be explained by radical chemistry starting with the reaction of center dot PO with HC center dot O, the latter being produced by reduction of CO2 over acidic dust in upper atmospheric layers of Venus by ultraviolet radiation. HPO, H2P center dot O, and H3P center dot OH have been identified as key intermediate species in our model pathway for phosphine synthesis.

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

Astrobiology

ISSN

1531-1074

e-ISSN

1557-8070

Svazek periodika

24

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

407-422

Kód UT WoS článku

001200313900001

EID výsledku v databázi Scopus

2-s2.0-85190486436