Electron impact ionization of acetaldehyde

Głuch, K.; Cytawa, J.; Michalak, Leszek

doi:10.1016/j.ijms.2008.02.006

Cited by 10 publications

(6 citation statements)

References 44 publications

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“…Measured cross sections for vibrational excitation by electron impact have shown both the π * resonance [10,11], at about 1.2 eV, and a further broad peak at 6.8 eV, assigned to one or more σ * resonances [10]. Other measurements have determined thresholds and, in some cases, relative cross sections for electronic excitation [8,10,[12][13][14][15][16], while still others have examined dissociative electron attachment [10,[17][18][19] and electron-impact ionization [20][21][22]. Burean and Swiderek [23] have studied the chemistry induced in condensed acetaldehyde by low-energy electron impact.…”

Section: Introductionmentioning

confidence: 99%

Low-energy elastic electron scattering by acetaldehyde

et al. 2014

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We report results from a combined experimental and computational study of low-energy electron interactions with acetaldehyde in the gas phase. Differential cross sections for elastic electron scattering were measured at selected incident energies from 1 to 50 eV, while corresponding first-principles calculations were carried out up to 30 eV. Integral and momentum-transfer cross sections were derived from the angle-differential data. The role of resonances in the scattering is examined and comparison is made to previous results for acetaldehyde and for its analogs, formamide and formic acid.

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Section: Introductionmentioning

confidence: 99%

Low-energy elastic electron scattering by acetaldehyde

et al. 2014

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“…Because of its prevalence and simplicity, acetaldehyde has been the subject of much investigation. In particular, its cationic form has been studied extensively using mass spectrometric techniques because of the complex isomerization and fragmentation chemistry of acetaldehyde after ionization . The small size of the system has been ideal for extensive theoretical studies as well .…”

Section: Introductionmentioning

confidence: 99%

Fourier transform infrared matrix‐isolation analysis of acetaldehyde fragmentation products after charge exchange with Ar^•+ under varied ionization density conditions

et al. 2011

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The products of the Ar(•+) charge exchange ionization of acetaldehyde have been isolated and compared with related photoionization results and computational work. Acetaldehyde has been used to assess the effect of varied ion density in the ionization region of the electron bombardment matrix isolation apparatus. The amount of acetaldehyde destruction has been measured for constant gas-sample composition and constant ionization current for two anode geometries: a pin anode and a plate anode. For the same ionization current, a pin-shaped anode demonstrates higher precursor molecule destruction efficiency (85%) than the plate-shaped anode (30%), resulting in substantial effect on the yield and quantity of isolated products. When the plate anode is used, the observed infrared products correspond to matrix-isolated carbon monoxide (CO), methane (CH(4)), ketene (CH(2)CO), ethynyloxy radical (HCCO), formyl radical (HCO(•)), acetyl radical (CH(3)CO(•)), vinyl alcohol (H(2)C = CH-OH), and cationic proton-bound dimer, Ar(2)H(+). When the pin anode is used, the same products are observed with different relative proportions and new absorption features corresponding to dicarbon monoxide (CCO) and methyl radical (CH(3)(•)) are observed. The surprising observation of infrared absorptions corresponding to vinyl alcohol along with low yield of products anticipated through the analysis of photoelectron-photoionization coincidence measurements suggests that the initially formed fragmentation products are able to further react within the matrix-isolation environment to influence observed product yields. Related experiments, using the isotopomer CD(3)CHO, suggest that the observed products are formed via radical-radical reactions that occur under the high pressure conditions of the matrix isolation environment.

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“…1,10,11,16,17 The explanation found in the literature for these cations is generally due to the presence of the isotope 13 C. In a brief analysis by Leach et al 16 for the case of acetic acid, m/q = 60, it is suggested that the appearance of the ion at m/q = 61 can be due to the presence of an isotope 13 C, to the molecular fragmentation of dimers, or to the fragmentation of a complex formed by water contamination. According to this work, the formation energy of a protonated ion from a dimer would be about 200 meV lower than the ion derived from monomers containing 13 Aim of the present work is to analyze the process of protonation due to the formation of dimers and their influence on the results of molecular ionization and fragmentation pattern at VUV range.…”

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confidence: 99%