Non-thermal ion desorption from an acetonitrile (CH3CN) astrophysical ice analogue studied by electron stimulated ion desorption

2015 ◽  
Vol 17 (41) ◽  
pp. 27473-27480 ◽  
Author(s):  
F. de A. Ribeiro ◽  
G. C. Almeida ◽  
Y. Garcia-Basabe ◽  
W. Wolff ◽  
H. M. Boechat-Roberty ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Thermal Desorption ◽  
Complex Molecules ◽  
Ion Desorption

Non-thermal desorption by electron impact constitutes an important route by which neutral and ionic fragments from simple nitrile-bearing ices may be delivered back to the gas-phase of astrophysical environments, contributing to the production of more complex molecules.

scholarly journals Chemical complexity in the Horsehead photodissociation region

2014 ◽  
Vol 168 ◽  
pp. 103-127 ◽  
Author(s):  
Viviana V. Guzmán ◽  
Jérôme Pety ◽  
Pierre Gratier ◽  
Javier R. Goicoechea ◽  
Maryvonne Gerin ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Gas Phase ◽  
Thermal Desorption ◽  
Organic Molecules ◽  
Dense Core ◽  
High Spectral Resolution ◽  
Complex Molecules ◽  
Chemical Complexity ◽  
Clean Environment ◽  
Complex Organic

The interstellar medium is known to be chemically complex. Organic molecules with up to 11 atoms have been detected in the interstellar medium, and are believed to be formed on the ices around dust grains. The ices can be released into the gas-phase either through thermal desorption, when a newly formed star heats the medium around it and completely evaporates the ices; or through non-thermal desorption mechanisms, such as photodesorption, when a single far-UV photon releases only a few molecules from the ices. The first mechanism dominates in hot cores, hot corinos and strongly UV-illuminated PDRs, while the second dominates in colder regions, such as low UV-field PDRs. This is the case of the Horsehead were dust temperatures are ≃20–30 K, and therefore offers a clean environment to investigate the role of photodesorption. We have carried out an unbiased spectral line survey at 3, 2 and 1mm with the IRAM-30m telescope in the Horsehead nebula, with an unprecedented combination of bandwidth, high spectral resolution and sensitivity. Two positions were observed: the warm PDR and a cold condensation shielded from the UV field (dense core), located just behind the PDR edge. We summarize our recently published results from this survey and present the first detection of the complex organic molecules HCOOH, CH2CO, CH3CHO and CH3CCH in a PDR. These species together with CH3CN present enhanced abundances in the PDR compared to the dense core. This suggests that photodesorption is an efficient mechanism to release complex molecules into the gas-phase in far-UV illuminated regions.

Chemical effects of low-energy electron impact on hydrocarbons in the gas phase. 2. Propene

1977 ◽  
Vol 81 (3) ◽  
pp. 199-206 ◽  
Author(s):  
R. Derai ◽  
J. Danon
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Low Energy ◽  
Energy Electron ◽  
Phase 2 ◽  
Chemical Effects ◽  
Low Energy Electron

Mass spectral study ofO- andS-aryl dimethylthiocarbamates under electron impact conditions: Newman-Kwart rearrangement in the gas phase

2001 ◽  
Vol 15 (22) ◽  
pp. 2127-2134 ◽  
Author(s):  
S. Prabhakar ◽  
Paramita Kar ◽  
S. P. Mirza ◽  
V. V. S. Lakshmi ◽  
K. Nagaiah ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Spectral Study ◽  
Mass Spectral ◽  
Mass Spectral Study

Ionizing fragmentation of uracil and 5-bromouracil by electron impact in gas phase and hyperthermal Ar+ ion irradiation in condensed phase

2007 ◽  
Vol 262 (1-2) ◽  
pp. 154-160 ◽  
Author(s):  
Marjorie Imhoff ◽  
Zongwu Deng ◽  
Michael A. Huels
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Condensed Phase ◽  
Ion Irradiation

D− ion desorption from condensed CD4, C2D2, C2D4, C2D6 and C3D8 molecules induced by electron impact

2003 ◽  
Vol 68 (1-2) ◽  
pp. 215-219 ◽  
Author(s):  
Paweł Możejko ◽  
Luc Parenteau ◽  
Andrew D. Bass ◽  
Léon Sanche
Keyword(s):  
Electron Impact ◽  
Ion Desorption

Fragmentation of 1,4,5,8-tetraazaphenanthrenes upon electron impact: A new example of structural integrity of gas phase heteroaromatic cations

1985 ◽  
Vol 20 (12) ◽  
pp. 733-737
Author(s):  
Raymonde Nasielski-Hinkens ◽  
Michel Kaisin ◽  
Robert Flammang ◽  
André Maquestiau
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Structural Integrity

Quantitative gas phase analysis by means of electron impact spectrometry

1971 ◽  
Vol 43 (2) ◽  
pp. 162-171 ◽  
Author(s):  
Richard E. Grojean ◽  
John F. Rendina
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Phase Analysis

Mass Spectrometric Studies of Physical, Thermochemical and Reactive Properties of Xenon Fluorides, Xenon Oxides and Xenon Oxyfluorides

2002 ◽  
Vol 8 (3) ◽  
pp. 233-246 ◽  
Author(s):  
Vladislav V. Zelenov ◽  
Elena V. Aparina ◽  
Alexander V. Loboda ◽  
Alexander S. Kukui ◽  
Alexander F. Dodonov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Saturated Vapor ◽  
Electron Impact Ionization ◽  
Binding Energies ◽  
Ionization Mass ◽  
Vapor Pressures ◽  
Gas Phase Reactions

Using a reactor with a flowing diffusion cloud coupled to a high-resolution, low-energy electron-impact ionization mass spectrometer, mechanistic, kinetic and thermochemical characteristics of gas-phase reactions with the participation of charged and neutral xenon oxides, xenon fluorides and xenon oxyfluorides have been investigated. Ionization energies for XeF, XeF2, XeF4, XeO3, XeO4, XeOF4 molecules and appearance energies for the ions formed from these molecules were obtained. Based on experimental and reference data, the enthalpies of XeO3 and XeOF4 formation were refined and a number of binding energies in the parent and fragment ions were calculated. For electron-impact ionization, the ionization cross-sections for Xe, XeF2, XeF4 and XeOF4 proved to correlate with a semi-empirical principle of full ionization. Based on the temperature dependencies of saturated vapor pressures for XeO4, XeOF4 and XeO2F2, their enthalpies of evaporation, sublimation and melting were determined. The mechanisms of gas-phase reactions between H atoms and neutral XeF2, XeF4, XeF6, XeO4 and XeOF4 were studied.

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