Photodissociation Mass Spectra and Mass-Selected Resonant (1+1)-Photodissociation Spectroscopy of Some Alkyl Iodide Radical Cations

Schüttig, Hannes; Grotemeyer, Jürgen

doi:10.1255/ejms.1150

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…By comparison with other dyes (Sulforhodamine B, Rhodamine B isothiocyanate, and Oxazine‐1), it could be concluded that the elimination of propane is a common feature of these dyes with a xanthene backbone. Also in 2011, the group published a study dealing with alkyl iodide radical cations (Schuttig & Grotemeyer, ). The experimental setup was different and included a reflectron time‐of‐flight mass spectrometer.…”

Section: Photodissociationmentioning

confidence: 99%

Photoionization and photofragmentation in mass spectrometry with visible and UV lasers

Gunzer

Krüger

Grotemeyer

2018

Mass Spectrometry Reviews

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Ever since the introduction of laser technology to the field of mass spectrometry, several disciplines evolved providing solutions to challenging scientific and analytical tasks in research and industry. Among these are techniques involving multiphoton ionization such as Resonance‐Enhanced Multiphoton Ionization (REMPI, R2PI) and Mass‐Analyzed Threshold Ionization (MATI) spectroscopy, a variant of Zero Kinetic Energy (ZEKE) spectroscopy, that possess the ability to selectively ionize certain preselected compounds out of complex mixtures, for example, environmental matrices, with a high level of efficiency. Another key feature of multiphoton ionization techniques is the ability to control the degree of fragmentation, whereas soft ionization is most highly appreciated in most applications. In cases where rich fragmentation patterns are desired for diagnostic purposes, Photodissociation mass spectrometry (PD‐MS) is applied successfully. PD‐MS allows for the cleavage of selected chemical bonds. With the introduction of chromophoric labels in PD‐MS, it became possible to target certain molecules or groups within a molecule. In this review article, an overview of the basic principles and experimental requirements of REMPI and MATI spectroscopy and PD mass spectrometry are given. By means of selected examples, the latest developments and application possibilities in this field over the past decade with special focus on the German research landscape are pointed out. © 2018 Wiley Periodicals, Inc. Mass Spec Rev 38: 202–217, 2019.

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Section: Photodissociationmentioning

confidence: 99%

Photoionization and photofragmentation in mass spectrometry with visible and UV lasers

Gunzer

Krüger

Grotemeyer

2018

Mass Spectrometry Reviews

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Multiphoton ionization dissociation dynamics of iodoethane studied with velocity map imaging technique

Yan¹,

Liu²,

Ding³

et al. 2018

Acta Phys. Sin.

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Halogenated alkanes destroy the ozone layer, and iodoethane is one of the important representative halogenated alkanes. Time-of-flight mass spectrometry and velocity map imaging technique are used for investigating the photoionization dissociation dynamics of iodoethane, induced by 800 nm femtosecond laser. The dissociation mechanisms of iodoethane are obtained and discussed by analyzing the velocity distributions and angular distributions of the fragment ions generated in the dissociation. The measurements by time-of-flight mass spectrometry show that iodoethane cations generates C2H5+, I+, CH2I+, C2H2+, C2H3+ and C2H4+. The fragments related to CI bond fragmentation are C2H5+ ions and I+ ions, and the dissociation mechanisms are C2H5I+ C2H5++I and C2H5I+ C2H5+I+ respectively. Comparison between the configurations before and after ionization shows that the CI bond length is 0.2220 nm before ionization and turns longer and becomes 0.2329 nm after ionization. This indicates that the CI bond becomes more unstable after ionization and is more prone to dissociation. Moreover, the velocity map images of C2H5+ and I+ ions are acquired, from which the speed and angular distribution of C2H5+ and I+ are obtained. The analysis of speed distribution of the fragment ions shows that there are two channels, i.e. high energy channel and low energy channel in the dissociation process for producing C2H5+ and I+ ion. The difference between the ratios of the high energy channel and the low energy channel is small, indicating that the high energy channel and the low energy channel of the two dissociation processes are similar. According to the further analysis of the angular distribution of the fragment ions, it is found that the anisotropy parameter of C2H5+ is close to 0 (isotropic), the production channel of which may correspond to the slow vibration predissociation process. The anisotropy parameters of I+ ions are higher, which may be due to the rapid dissociation process on the repulsive potential energy surface. In addition, the density functional theory is used to calculate the configuration change of the iodoethane molecule before and after ionization, the energy level and oscillator strength for the ionic state in order to obtain more insights into the photodissociation dynamics.

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Photodissociation Mass Spectra and Mass-Selected Resonant (1+1)-Photodissociation Spectroscopy of Some Alkyl Iodide Radical Cations

Cited by 2 publications

References 26 publications

Photoionization and photofragmentation in mass spectrometry with visible and UV lasers

Photoionization and photofragmentation in mass spectrometry with visible and UV lasers

Multiphoton ionization dissociation dynamics of iodoethane studied with velocity map imaging technique

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