Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)

A windowless vacuum ultraviolet monochromator and mass spectrometer are combined for the study of photoionization processes in the energy range 2000 to 600 A (6 to 21 eV). Details of the apparatus and techniques of operation are given and results are reported for an initial study of acetylene, acety...

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Autores principales: Dibeler, Vernon H., Reese, Robert M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1964
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323055/
https://www.ncbi.nlm.nih.gov/pubmed/31834697
http://dx.doi.org/10.6028/jres.068A.040
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author Dibeler, Vernon H.
Reese, Robert M.
author_facet Dibeler, Vernon H.
Reese, Robert M.
author_sort Dibeler, Vernon H.
collection PubMed
description A windowless vacuum ultraviolet monochromator and mass spectrometer are combined for the study of photoionization processes in the energy range 2000 to 600 A (6 to 21 eV). Details of the apparatus and techniques of operation are given and results are reported for an initial study of acetylene, acetylene-d(2), benzene, and benzene-d(6). Ionization energies of 11.406 and 11.416 eV are obtained for the 1π(u) electron of C(2)H(2) and C(2)D(2), respectively. Vibrational levels of the ground state of the ion are observed with quantum intervals of 1855 cm(−1)(C(2)H(2)) and 1775 cm(−1)(C(2)D(2)). Ionization energies for the e(1)(g)(π) electron of C(6)H(6) and C(6)D(6) are determined to be 9.24(2) and 9.24(5) eV, respectively. Quantum intervals for vibrational levels of the ground state ions are apparently equal for the two isotopic molecules and estimated to be 800 cm(−1). A second onset of ionization is observed at 11.5(3) eV for C(6)H(6) and at 11.5(9) eV for C(6)D(6). Results agree well with spectroscopic data.
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spelling pubmed-53230552019-12-10 Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6) Dibeler, Vernon H. Reese, Robert M. J Res Natl Bur Stand A Phys Chem Article A windowless vacuum ultraviolet monochromator and mass spectrometer are combined for the study of photoionization processes in the energy range 2000 to 600 A (6 to 21 eV). Details of the apparatus and techniques of operation are given and results are reported for an initial study of acetylene, acetylene-d(2), benzene, and benzene-d(6). Ionization energies of 11.406 and 11.416 eV are obtained for the 1π(u) electron of C(2)H(2) and C(2)D(2), respectively. Vibrational levels of the ground state of the ion are observed with quantum intervals of 1855 cm(−1)(C(2)H(2)) and 1775 cm(−1)(C(2)D(2)). Ionization energies for the e(1)(g)(π) electron of C(6)H(6) and C(6)D(6) are determined to be 9.24(2) and 9.24(5) eV, respectively. Quantum intervals for vibrational levels of the ground state ions are apparently equal for the two isotopic molecules and estimated to be 800 cm(−1). A second onset of ionization is observed at 11.5(3) eV for C(6)H(6) and at 11.5(9) eV for C(6)D(6). Results agree well with spectroscopic data. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1964 1964-08-01 /pmc/articles/PMC5323055/ /pubmed/31834697 http://dx.doi.org/10.6028/jres.068A.040 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
spellingShingle Article
Dibeler, Vernon H.
Reese, Robert M.
Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title_full Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title_fullStr Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title_full_unstemmed Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title_short Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d(2), Benzene, and Benzene-d(6)
title_sort mass spectrometric study of photoionization. i. apparatus and initial observations on acetylene, acetylene-d(2), benzene, and benzene-d(6)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323055/
https://www.ncbi.nlm.nih.gov/pubmed/31834697
http://dx.doi.org/10.6028/jres.068A.040
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