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Atmospheric‐pressure Penning ionization mass spectrometry
Author(s) -
Hiraoka Kenzo,
Fujimaki Susumu,
Kambara Shizuka,
Furuya Hiroko,
Okazaki Shigemitsu
Publication year - 2004
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1624
Subject(s) - chemistry , penning ionization , mass spectrometry , analytical chemistry (journal) , ionization , atmospheric pressure , ion , argon , dart ion source , ion source , ambient ionization , quadrupole mass analyzer , chemical ionization , atmospheric pressure chemical ionization , electron ionization , atmospheric pressure laser ionization , atomic physics , chromatography , organic chemistry , oceanography , physics , geology
A preliminary study on the atmospheric‐pressure Penning ionization (APP e I) of gaseous organic compounds with Ar* has been made. The metastable argon atoms (Ar*: 11.55 eV for 3 P 2 and 11.72 eV for 3 P 0 ) were generated by the negative‐mode corona discharge of atmospheric‐pressure argon gas. By applying a high positive voltage (+500 to +1000 V) to the stainless steel capillary for the sample introduction (0.1 mm i.d., 0.3 mm o.d.), strong ion signals could be obtained. The ions formed were sampled through an orifice into the vacuum and mass‐analyzed by an orthogonal time‐of‐flight mass spectrometer. The major ions formed by APP e I are found to be molecular‐related ions for alkanes, aromatics, and oxygen‐containing compounds. Because only the molecules with ionization energies less than the internal energy of Ar* are ionized, the present method will be a selective and highly sensitive interface for gas chromatography/mass spectrometry. Copyright © 2004 John Wiley & Sons, Ltd.