scholarly journals Vacuum-Ultraviolet (VUV) Photoionization of Small Methanol and Methanol−Water Clusters†

2008 ◽  
Vol 112 (39) ◽  
pp. 9555-9562 ◽  
Author(s):  
Oleg Kostko ◽  
Leonid Belau ◽  
Kevin R. Wilson ◽  
Musahid Ahmed
Keyword(s):  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Vuv Photoionization

Vacuum Ultraviolet (VUV) Photoionization of Small Water Clusters

2007 ◽  
Vol 111 (40) ◽  
pp. 10075-10083 ◽  
Author(s):  
Leonid Belau ◽  
Kevin R. Wilson ◽  
Stephen R. Leone ◽  
Musahid Ahmed
Keyword(s):  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Small Water ◽  
Vuv Photoionization

scholarly journals Vacuum Ultraviolet (VUV) Photoionization of Small Water Clusters

2007 ◽  
Vol 111 (42) ◽  
pp. 10885-10886 ◽  
Author(s):  
Leonid Belau ◽  
Kevin R. Wilson ◽  
Stephen R. Leone ◽  
Musahid Ahmed
Keyword(s):  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Small Water ◽  
Vuv Photoionization

Structures of Pyridine–Water Clusters Studied with Infrared–Vacuum Ultraviolet Spectroscopy

2021 ◽  
Vol 125 (34) ◽  
pp. 7489-7501
Author(s):  
Jun-Ying Feng ◽  
Yuan-Pern Lee ◽  
Henryk A. Witek ◽  
Po-Jen Hsu ◽  
Jer-Lai Kuo ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Ultraviolet Spectroscopy ◽  
Vacuum Ultraviolet Spectroscopy

scholarly journals The Potential of Vacuum Ultraviolet Photoionization Mass Spectrometry in Monitoring Photofragmentation of Organometallics

1993 ◽  
Vol 13 (2) ◽  
pp. 113-119 ◽  
Author(s):  
S. Georgiou ◽  
E. Mastoraki ◽  
E. Raptakis ◽  
Z. Xenidi
Keyword(s):  
Molecular Beam ◽  
Vacuum Ultraviolet ◽  
Impact Ionization ◽  
Microwave Discharge ◽  
Fragmentation Pattern ◽  
Photoionization Mass Spectrometry ◽  
Vuv Photoionization ◽  
Ionic Fragmentation ◽  
Deposition Processes ◽  
Fragmentation Patterns

The paper examines the potential of vacuum ultraviolet (VUV) photoionization mass spectroscopy in probing the fragmentation of organometallics in molecular-beam studies and laser-assisted deposition processes. To this end, the ionic fragmentation pattern of few common organometallics, namely metallocenes and carbonyls, is examined at selected VUV wavelengths, produced by microwave-discharge resonance atomic lamps. Discussion of the recorded spectra in terms of the electronic structure of the compounds indicates lack of dynamical bias in the VUV photoionization/fragmentation of metal complexes. Excitation with VUV light results in simpler ionic fragmentation patterns than what observed with electron-impact ionization, thereby enabling accurate monitoring of the excimer-laser photodissociation of organometallics. Finally, the intensity of the VUV ionic signal appears to be adequate for molecular-beam studies. An illustrative example is provided for the study of the 248nm-induced photodesorption of Mo(CO)6 from cryogenic films.

Vacuum ultraviolet photochemistry of the conformers of the ethyl peroxy radical

2021 ◽  
Vol 23 (38) ◽  
pp. 22096-22102
Author(s):  
Zuoying Wen ◽  
Xiaoxiao Lin ◽  
Xiaofeng Tang ◽  
Bo Long ◽  
Chengcheng Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Vacuum Ultraviolet ◽  
Theoretical Calculations ◽  
Peroxy Radical ◽  
Photoionization Mass Spectrometry ◽  
Condon Factors ◽  
Vuv Photoionization ◽  
Franck Condon

C2H5O2 plus its gauche and trans conformers are studied using synchrotron-based VUV photoionization mass spectrometry and theoretical calculations, and it is found that the gauche conformer has favorable Franck–Condon factors in photoionization.

Progress in Fixed-Photon-Energy Time-Efficient Double Imaging Photoelectron/Photoion Coincidence Measurements in Quantitative Flame Analysis

2016 ◽  
Vol 230 (8) ◽  
Author(s):  
Daniel Felsmann ◽  
Arnas Lucassen ◽  
Julia Krüger ◽  
Christian Hemken ◽  
Luc-Sy Tran ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Synchrotron Radiation ◽  
Photon Energy ◽  
Molecular Beam ◽  
Vacuum Ultraviolet ◽  
Photoelectron Spectra ◽  
Combustion Analysis ◽  
Molecular Beam Mass Spectrometry ◽  
Vuv Photoionization ◽  
Coincidence Measurements

AbstractPhotoelectron photoion coincidence (PEPICO) spectroscopy as an attractive new technique for combustion analysis was used in a fixed-photon-energy configuration to provide quantitative species profiles in laminar premixed flames. While such measurements are conventionally performed with molecular-beam mass spectrometry (MBMS) using electron ionization (EI) or vacuum ultraviolet (VUV) photoionization (PI) with synchrotron radiation, these techniques have some limitations. The possibility to record photoelectron spectra (PES) simultaneously with photoionization data, providing fingerprint information for reliable species identification, presents a significant advantage of PEPICO spectroscopy especially in complex reactive mixtures. The multiplex approach presented here, enhanced by the imaging capabilities of the electron and ion detection in the so-called double-imaging PEPICO scheme (i

scholarly journals Infrared spectroscopy of neutral water clusters at finite temperature: Evidence for a noncyclic pentamer

2020 ◽  
Vol 117 (27) ◽  
pp. 15423-15428 ◽  
Author(s):  
Bingbing Zhang ◽  
Yong Yu ◽  
Yang-Yang Zhang ◽  
Shukang Jiang ◽  
Qinming Li ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Liquid Water ◽  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Bulk Water ◽  
Infrared Spectroscopic Study ◽  
Stretching Vibration ◽  
Hydrogen Bonding Networks ◽  
Neutral Water

Infrared spectroscopic study of neutral water clusters is crucial to understanding of the hydrogen-bonding networks in liquid water and ice. Here we report infrared spectra of size-selected neutral water clusters, (H2O)n(n= 3−6), in the OH stretching vibration region, based on threshold photoionization using a tunable vacuum ultraviolet free-electron laser. Distinct OH stretch vibrational fundamentals observed in the 3,500−3,600-cm−1region of (H2O)5provide unique spectral signatures for the formation of a noncyclic pentamer, which coexists with the global-minimum cyclic structure previously identified in the gas phase. The main features of infrared spectra of the pentamer and hexamer, (H2O)n(n= 5 and 6), span the entire OH stretching band of liquid water, suggesting that they start to exhibit the richness and diversity of hydrogen-bonding networks in bulk water.

scholarly journals Conformer-dependent vacuum ultraviolet photodynamics and chiral asymmetries in pure enantiomers of gas phase proline

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Rim Hadidi ◽  
Dušan K. Božanić, ◽  
Hassan Ganjitabar ◽  
Gustavo A. Garcia ◽  
Ivan Powis ◽  
...  
Keyword(s):  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Energy Difference ◽  
Molecular Structures ◽  
Fragmentation Behavior ◽  
Conformational Landscape ◽  
Vuv Photoionization ◽  
Molecular Electronic Structure ◽  
Unique Amino Acid ◽  
Structure Calculations

AbstractProline is a unique amino-acid, with a secondary amine fixed within a pyrrolidine ring providing specific structural properties to proline-rich biopolymers. Gas-phase proline possesses four main H-bond stabilized conformers differing by the ring puckering and carboxylic acid orientation. The latter defines two classes of conformation, whose large ionization energy difference allows a unique conformer-class tagging via electron spectroscopy. Photoelectron circular dichroism (PECD) is an intense chiroptical effect sensitive to molecular structures, hence theorized to be highly conformation-dependent. Here, we present experimental evidence of an intense and striking conformer-specific PECD, measured in the vacuum ultraviolet (VUV) photoionization of proline, as well as a conformer-dependent cation fragmentation behavior. This finding, combined with theoretical modeling, allows a refinement of the conformational landscape and energetic ordering, that proves inaccessible to current molecular electronic structure calculations. Additionally, astrochemical implications regarding a possible link of PECD to the origin of life’s homochirality are considered in terms of plausible temperature constraints.

scholarly journals Real-time monitoring of trace-level VOCs by an ultrasensitive compact lamp-based VUV photoionization mass spectrometer

2015 ◽  
Vol 8 (6) ◽  
pp. 5877-5894 ◽  
Author(s):  
W. Q. Sun ◽  
J. N. Shu ◽  
P. Zhang ◽  
Z. Li ◽  
N. N. Li ◽  
...  
Keyword(s):  
Real Time ◽  
Mass Spectrometer ◽  
Vacuum Ultraviolet ◽  
Acquisition Time ◽  
The Novel ◽  
Trace Level ◽  
Reflection Time ◽  
Volatile Organic ◽  
Vuv Photoionization ◽  
Beijing China

Abstract. In this study, we report on the development of a compact lamp-based vacuum ultraviolet (VUV) photoionization mass spectrometer (PIMS; hereafter referred to as VUV-PIMS) in our laboratory; it is composed of a radio frequency-powered VUV lamp, a VUV photoionizer, an ion-immigration region, and a reflection time-of-flight mass spectrometer. By utilizing the novel photoionizer consisting of a photoionization cavity and a VUV light baffle, extremely low background noise was obtained. An ultrasensitive detection limit (2σ) of 3 pptv was achieved for benzene after an acquisition time of 10 s. To examine its potential for application in real-time sample monitoring, the developed VUV-PIMS was employed for the continuous measurement of urban air for six days in Beijing, China. Strong signals of trace-level volatile organic compounds such as benzene and its alkylated derivatives were observed in the mass spectra. These initial experimental results reveal that the instrument can be used for the online monitoring of trace-level species in the atmosphere.

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