Positive and negative ionic desorption from condensed formic acid photoexcited around the O 1s-edge: Relevance to cometary and planetary surfaces

被引：11

作者：

Andrade, D. P. P. ^{[1
,2
]}

Boechat-Roberty, H. M. ^{[3
]}

Pilling, S. ^{[1
]}

da Silveira, E. F. ^{[4
]}

Rocco, M. L. M. ^{[2
]}

机构：

[1] Univ Vale Paraiba, Inst Pesquisa & Desenvolvimento, BR-12244000 Sao Jose Do Campos, SP, Brazil

[2] Univ Fed Rio de Janeiro, Inst Quim, BR-21949900 Rio De Janeiro, Brazil

[3] Univ Fed Rio de Janeiro, Observ Valongo, BR-21949900 Rio De Janeiro, Brazil

[4] Pontificia Univ Catolica Rio de Janeiro, BR-22453900 Rio De Janeiro, Brazil

来源：

SURFACE SCIENCE | 2009年 / 603卷 / 22期

基金：

巴西圣保罗研究基金会;

关键词：

Desorption induced by electronic transitions (DIET); Photon stimulated ion desorption (PSID); Surface photochemistry; Desorption induced by photon stimulation; Condensed formic acid; Time-of-flight mass spectrometry; Astrochemistry; SAGITTARIUS B2; LINE SURVEY; PARTICLES; MOLECULES; SPECTRA; SEARCH; ORIGIN; YIELD; LMH; GHZ;

D O I：

10.1016/j.susc.2009.09.020

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：

Photon stimulated ion desorption (PSID) studies have been performed in condensed formic acid using oxygen 1s-edge synchrotron radiation from the Brazilian synchrotron light source (LNLS), operating in a single-bunch mode. Ion formation was discussed in terms of the Auger stimulated ion desorption (ASID) and X-ray induced electron stimulated desorption (XESD) mechanisms. It is found that O 1s(C-OH) -> pi*(C=O) and O 1s(C=O) -> 3s/sigma*(HCO) transitions favored the production of C+, CH+, O+, O- and H- ions. The hydroxyl anion has not been observed while the hydroxyl cation showed low intensity or was absent. Some anion formation routes from dissociative reactions are suggested taking into account the positive ion yields. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：3301 / 3306

页数：6

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