Photoelectron Photoion Coincidence Studies of Ion Dissociation Dynamics

Baer, Tomas; Booze, Jon A.; Weitzel, Karl‐Michael

doi:10.1142/9789812814821_0005

Cited by 53 publications

(38 citation statements)

References 69 publications

(99 reference statements)

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“…The unimolecular reactions of fluoromethane ions have been investigated by means of the threshold photoelectron photoion coincidence technique (TPEPICO) [16,17]. Details of the experimental setup have been described previously [20].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…To resolve this question it seems promising to apply a PEPICO technique based on resonant photoionization, i.e. the threshold photoelectron photoion coincidence (TPEPICO) technique [16,17]. This experiment would allow us to measure the KER in the CH 3 + ions as a function of the internal energy of the parent ions over the entire region where the F loss reaction is observed.…”

Section: Introductionmentioning

confidence: 99%

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Statistical and non-statistical reactions in energy selected fluoromethane ions

et al. 1995

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The unimolecular reactions of the fluoromethane ion have been investigated by the threshold photoelectron photoion coincidence technique (TPEPICO). The breakdown curves have been measured in the energy range between the adiabatic ionization potential of 12.53 eV and 21 eV. In this energy range the formation of the CH 2 F + , CHF + , CH 2 + , CH 3 + , and CF + fragment ions is observed. The appearance energies (AE) for these ions at 300 K are 13.2, 13.91, 13.93, 14.51 and < 17.7 eV respectively. The 0 K threshold energy for the formation of CH 2 F + ions is 13.37 eV. Two different pathways for the unimolecular reaction of the fluoromethane ion can be distinguished. The reaction proceeding through the electronic ground state of the ion is entirely statistical. In contrast to this the reaction occurring through the first electronic excited state shows nonstatistical behaviour. The two pathways are distinguished via the kinetic energy released in the respective dissociation channels. While all thermochemically allowed reaction channels are observed on the ion ground state potential, the first excited state seems to decay predominantly by F loss reaction.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical and non-statistical reactions in energy selected fluoromethane ions

et al. 1995

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“…The problem here is that mass selection on neutral molecules is not possible. In this case so‐called photoion photoelectron coincidence spectroscopy is applied (Brehm & von Puttkammer, ; Baer, Booze, & Weitzel, ). The ion yield per ionization pulse is reduced to less than one.…”

Section: Some Instrumental and Experimental Options Of Time‐of‐flightmentioning

confidence: 99%

Time-of-flight mass spectrometry: Introduction to the basics

Boesl

2016

Mass Spec Rev

104

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The intention of this tutorial is to introduce into the basic concepts of time-of-flight mass spectrometry, beginning with the most simple single-stage ion source with linear field-free drift region and continuing with two-stage ion sources combined with field-free drift regions and ion reflectors-the so-called reflectrons. Basic formulas are presented and discussed with the focus on understanding the physical relations of geometric and electric parameters, initial distribution of ionic parameters, ion flight times, and ion flight time incertitude. This tutorial is aimed to help the applicant to identify sources of flight time broadening which limit good mass resolution and sources of ion losses which limit sensitivity; it is aimed to stimulate creativity for new experimental approaches by discussing a choice of instrumental options and to encourage those who toy with the idea to build an own time-of-flight mass spectrometer. Large parts of mathematics are shifted into a separate chapter in order not to overburden the text with too many mathematical deviations. Rather, thumbrule formulas are supplied for first estimations of geometry and potentials when designing a home-built instrument, planning experiments, or searching for sources of flight time broadening.

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“…Extensions of the VMI technique are three-dimensional ion imaging by simultaneously measuring ion positions and flight times [136], as well as slice imaging by selecting parts of the ion cloud through fast gating of the detector [137]. An even higher level of detail is reached when photoions and photoelectrons are detected in coincidence (PEPICO [113,138,139]). …”

Section: Ion Imagingmentioning

confidence: 99%

Photoionisaton of pure and doped helium nanodroplets

Mudrich

Stienkemeier

2014

International Reviews in Physical Chemistry

118

114

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Helium nanodroplets, commonly regarded as the "nearly ideal spectroscopic matrix", are being actively studied for more than two decades now. While they mostly serve as cold, weakly perturbing and transparent medium for high-resolution spectroscopy of embedded molecules, their intrinsic quantum properties such as microscopic superfluidity still are subject-matter of current research. This article reviews recent work on pure and doped He nanodroplets using PI spectroscopy, an approach which has greatly advanced in the past years. While the notion of the ideal spectroscopic matrix mostly no longer holds in this context, photoionization techniques provide detailed insights into the photo-physical properties of pure and doped He nanodroplets and their relaxation dynamics following electronic excitation. Exploiting nowadays available high laser fields, even highly ionized states of matter on the nanoscale can be formed. Our particular focus lies on recent experimental progress including fs time-resolved spectroscopy, photoion and electron imaging, and novel sources of highly energetic radiation.

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Photoelectron Photoion Coincidence Studies of Ion Dissociation Dynamics

Cited by 53 publications

References 69 publications

Statistical and non-statistical reactions in energy selected fluoromethane ions

Statistical and non-statistical reactions in energy selected fluoromethane ions

Time-of-flight mass spectrometry: Introduction to the basics

Photoionisaton of pure and doped helium nanodroplets

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