Vacuum ultraviolet photolysis of CH4:O2 ice mixtures and the formation of CO and CO2

被引：2

作者：

Chou, Sheng-Lung ^{[1
]}

Lin, Meng-Yeh ^{[1
]}

Huang, Tzu-Ping ^{[1
]}

Wu, Yu-Jong ^{[1
,2
,3
]}

机构：

[1] Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd,Hsinchu Sci Pk, Hsinchu 30076, Taiwan

[2] Natl Chiao Tung Univ, Dept Appl Chem, 1001 Ta Hsueh Rd, Hsinchu 30010, Taiwan

[3] Natl Chiao Tung Univ, Inst Mol Sci, 1001 Ta Hsueh Rd, Hsinchu 30010, Taiwan

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2020年 / 1209卷

关键词：

IR spectroscopy; Photochemistry; Cosmic ices; Interstellar oxygen depletion; ABSOLUTE INFRARED INTENSITIES; POTENTIAL-ENERGY SURFACE; INTERSTELLAR ICE; CARBON-DIOXIDE; METHANE; MOLECULES; CHEMISTRY; CLOUDS; PHOTOCHEMISTRY; IRRADIATION;

D O I：

10.1016/j.molstruc.2020.127954

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Vacuum ultraviolet (VUV) photolysis of CH4:O-2 ice mixtures at 10 K using 121.6, 157, and 170-nm wavelengths was performed to examine photochemical reactions for the oxidation of hydrocarbon species. Ice samples with three component ratios were prepared: CH4-dominated (CH4:O-2 = 100:1), mixed (CH4:O-2 = 1:1), and O-2-dominated (CH4:O-2 = 1:100) ice samples. Photochemical behavior with dependence on the photolysis wavelength and component ratio was observed. In addition, the column densities of CO and CO2 formed by the VUV photolysis of the three ice samples and the abundance ratios of CO and CO2 as a function of the photon dosage and photolysis wavelength were examined. The results may imply a correlation between the unknown depletion of interstellar oxygen and the formation of CO and CO2. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8

共 53 条

[1] A comparison of ion irradiation and UV photolysis of CH4 and CH3OH [J].

Baratta, GA ;

Leto, G ;

Palumbo, ME .

ASTRONOMY & ASTROPHYSICS, 2002, 384 (01) :343-349

[2] The formation of acetic acid (CH3COOH) in interstellar ice analogs [J].

Bennett, Chris J. ;

Kaiser, Ralf I. .

ASTROPHYSICAL JOURNAL, 2007, 660 (02) :1289-1295

[3] Laboratory studies on the irradiation of methane in interstellar, cometary, and solar system ices [J].

Bennett, Chris J. ;

Jamieson, Corey S. ;

Osamura, Yoshihiro ;

Kaiser, Ralf I. .

ASTROPHYSICAL JOURNAL, 2006, 653 (01) :792-811

[4] GAS-PHASE CHEMISTRY IN DENSE INTERSTELLAR CLOUDS INCLUDING GRAIN SURFACE MOLECULAR DEPLETION AND DESORPTION [J].

BERGIN, EA ;

LANGER, WD ;

GOLDSMITH, PF .

ASTROPHYSICAL JOURNAL, 1995, 441 (01) :222-243

[5] Methanol Formation via Oxygen Insertion Chemistry in Ices [J].

Bergner, Jennifer B. ;

Oberg, Karin I. ;

Rajappan, Mahesh .

ASTROPHYSICAL JOURNAL, 2017, 845 (01)

[6] Observations of the Icy Universe [J].

Boogert, A. C. Adwin ;

Gerakines, Perry A. ;

Whittet, Douglas C. B. .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 53, 2015, 53 :541-581

[7] GRAIN-SURFACE FORMATION OF MULTI-DEUTERATED MOLECULES [J].

BROWN, PD ;

MILLAR, TJ .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1989, 240 (02) :P25-P29

[8] IR kinetic spectroscopy investigation of the CH4+O(1D) reaction [J].

Chen, HB ;

Thweatt, WD ;

Wang, JJ ;

Glass, GP ;

Curl, RF .

JOURNAL OF PHYSICAL CHEMISTRY A, 2005, 109 (10) :2207-2216

[9] UV absorption spectrum of allene radical cations in solid argon [J].

Chin, Chih-Hao ;

Lin, Meng-Yeh ;

Huang, Tzu-Ping ;

Wu, Yu-Jong .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2018, 196 :233-237

[10] INFRARED AND ULTRAVIOLET SPECTRA OF METHANE DILUTED IN SOLID NITROGEN AND IRRADIATED WITH ELECTRONS DURING DEPOSITION AT VARIOUS TEMPERATURES [J].

Chin, Chih-Hao ;

Chen, Sian-Cong ;

Liu, Meng-Chen ;

Huang, Tzu-Ping ;

Wu, Yu-Jong .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2016, 224 (02)

← 1 2 3 4 5 6 →