Vacuum ultraviolet photochemistry of sulfuric acid vapor： A combined experimental and theoretical study

2021 ◽  
Author(s):  
Cuihong Zhang ◽  
Xiaoxiao Lin ◽  
Xiaofeng Tang ◽  
Christa Fittschen ◽  
Sebastian Hartweg ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Synchrotron Radiation ◽  
Energy Range ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Theoretical Study ◽  
Acid Vapor ◽  
Vuv Photoionization

We present a vacuum ultraviolet (VUV) photoionization study of the gas-phase sulfuric acid (H2SO4) molecule in the 11-14 eV energy range by using the method of synchrotron radiation-based double imaging...

scholarly journals Vacuum Ultraviolet Photoionization Study of Gas Phase Vitamins A and B1 Using Aerosol Thermodesorption and Synchrotron Radiation

2014 ◽  
Vol 118 (47) ◽  
pp. 11185-11192 ◽  
Author(s):  
Héloïse Dossmann ◽  
Adrián Schwarzenberg ◽  
Denis Lesage ◽  
Marie Pérot-Taillandier ◽  
Carlos Afonso ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Gas Phase ◽  
Vacuum Ultraviolet

C–F and C–H bond cleavage mechanisms of trifluoromethane ions in low-lying electronic states: threshold photoelectron–photoion coincidence imaging and theoretical investigations

2020 ◽  
Vol 22 (24) ◽  
pp. 13808-13817
Author(s):  
Yan Chen ◽  
Tongpo Yu ◽  
Xiangkun Wu ◽  
Xiaoguo Zhou ◽  
Shilin Liu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Energy Range ◽  
Radiation Source ◽  
Vacuum Ultraviolet ◽  
Bond Cleavage ◽  
Electronic States ◽  
Synchrotron Radiation Source ◽  
Dissociative Ionization ◽  
Theoretical Investigations ◽  
Coincidence Imaging

Dissociative ionization of trifluoromethane (CHF3) is investigated in the 13.9–18.0 eV energy range using the threshold photoelectron–photoion coincidence (TPEPICO) technique coupled to a vacuum ultraviolet synchrotron radiation source.

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

Performance of the BL03U beamline at SSRF

2020 ◽  
Vol 27 (5) ◽  
pp. 1388-1394
Author(s):  
Z. P. Sun ◽  
Z. H. Liu ◽  
Z. T. Liu ◽  
W. L. Liu ◽  
F. Y. Zhang ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Energy Range ◽  
Photon Energy ◽  
Vacuum Ultraviolet ◽  
Resolving Power ◽  
Photon Energy Range ◽  
Photoemission Spectroscopy ◽  
Theoretical Estimation ◽  
Shanghai Synchrotron Radiation Facility ◽  
Angle Resolved Photoemission Spectroscopy

The vacuum ultraviolet beamline BL03U with a photon energy range from 7 eV upwards has been constructed at the 3.5 GeV Shanghai Synchrotron Radiation Facility. Equipped with an APPLE-Knot undulator, this beamline is dedicated to angle-resolved photoemission spectroscopy. An energy-resolving power of higher than 4.6 × 104 has been achieved in the photon energy range 21.6–48 eV, which is almost the same as the theoretical estimation.

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.

The photoabsorption of chlorodifluoroethenes in the vacuum ultraviolet

1985 ◽  
Vol 63 (7) ◽  
pp. 1949-1954 ◽  
Author(s):  
Eckart Rühl ◽  
Hans-Werner Jochims ◽  
Helmut Baumgärtel
Keyword(s):  
Energy Range ◽  
Ionization Potential ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Photon Energy ◽  
Vacuum Ultraviolet ◽  
Rydberg Series ◽  
Absorption Bands ◽  
Broad Absorption ◽  
Cis And Trans

The gas phase absorption spectra of 2-chloro-1,1-difluoroethene, cis- and trans-1-chloro-1,2-difluoroethene have been measured in the photon energy range from 6.5 to 25 eV. The π → π* transition is assigned to bands centered around 7.17 – 7.20 eV for all three isomers. Four Rydberg series are observed in all the spectra, converging to the π ionization potential: two np-type Rydberg series, one ns, and one nd series are assigned. The convergence limits are: 9.84 eV (2-chloro-1,1-difluoroethene), 9.86 eV (trans-1-chloro-1,2-difluoroethene), and 9.85 eV (trans-1-chloro-1,2-difluoroethene). In the case of 2-chloro-1,1-difluoroethene four additional Rydberg series are found converging to the nCl ionization potential. The convergence limit of these series is 12.15 eV.Above 12 eV broad absorption bands dominate the spectra.

Photoionization Study of L-Valine in the Gas Phase by Vacuum Ultraviolet Synchrotron Radiation

2011 ◽  
Vol 17 (2) ◽  
pp. 101-112 ◽  
Author(s):  
Shaohui Zhou ◽  
Genbai Chu ◽  
Lanlan Cao ◽  
Xiaobin Shan ◽  
Fuyi Liu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Gas Phase ◽  
Vacuum Ultraviolet

scholarly journals Photodesorption of Acetonitrile CH3CN in UV-irradiated Regions of the Interstellar Medium: Experimental Evidence

2021 ◽  
Vol 922 (2) ◽  
pp. 213
Author(s):  
Romain Basalgète ◽  
Antonio Jesus Ocaña ◽  
Géraldine Féraud ◽  
Claire Romanzin ◽  
Laurent Philippe ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Interstellar Medium ◽  
Experimental Evidence ◽  
Gas Phase ◽  
Significant Influence ◽  
Vacuum Ultraviolet ◽  
Organic Molecules ◽  
Protoplanetary Disks ◽  
Desorption Process ◽  
The One

Abstract Pure acetonitrile (CH3CN) and mixed CO:CH3CN and H2O:CH3CN ices have been irradiated at 15 K with vacuum ultraviolet (VUV) photons in the 7–13.6 eV range using synchrotron radiation. VUV photodesorption yields of CH3CN and of photoproducts have been derived as a function of the incident photon energy. The coadsorption of CH3CN with CO and H2O molecules, which are expected to be among the main constituents of interstellar ices, is found to have no significant influence on the VUV photodesorption spectra of CH3CN, CHCN•, HCN, CN•, and CH3•. Contrary to what has generally been evidenced for most of the condensed molecules, these findings point toward a desorption process for which the CH3CN molecule that absorbs the VUV photon is the one desorbing. It can be ejected in the gas phase as intact CH3CN or in the form of its photodissociation fragments. Astrophysical VUV photodesorption yields, applicable to different locations, are derived and can be incorporated into astrochemical modeling. They vary from 0.67(± 0.33) × 10−5 to 2.0(± 1.0) × 10−5 molecule photon−1 for CH3CN depending on the region considered, which is high compared to other organic molecules such as methanol. These results could explain the multiple detections of gas-phase CH3CN in different regions of the interstellar medium and are well correlated to astrophysical observations of the Horsehead nebula and of protoplanetary disks (such as TW Hya and HD 163296).

Theoretical Study on the Gas Phase Reaction of Sulfuric Acid with Hydroxyl Radical in the Presence of Water

2011 ◽  
Vol 115 (8) ◽  
pp. 1350-1357 ◽  
Author(s):  
Bo Long ◽  
Wei-jun Zhang ◽  
Xing-feng Tan ◽  
Zheng-wen Long ◽  
Yi-bo Wang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Hydroxyl Radical ◽  
Gas Phase ◽  
Theoretical Study ◽  
Phase Reaction ◽  
Gas Phase Reaction
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