The emission of sputtered ions from isoleucine and leucine specimens under bombardment by 10 keV argon gas-cluster ions was investigated by orthogonal time-of-flight secondary ion mass spectrometry, in an attempt to examine the possibility of discriminating these amino acids by means of specific differences in their mass spectra. Apart from of the protonated molecular ions (M+H)+ a prolific flux of singly charged and doubly charged molecular cluster ions, (Mn+H)+ (1 ≤ n ≤ 15) and (Mn+2H)2+ (8 ≤ n ≤ 29) was observed. The distributions of the cluster yields Yn as a function of their size n were found to be very similar for both amino acids. In addition, the fraction of emitted fragment and other ion species is typically low, and no distinct differences were detected for isoleucine and leucine. Therefore, the present data seem to indicate that a discrimination of isoleucine and leucine via mass spectrometric means is not possible.
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Research Article|
January 12 2016
Secondary ion emission from leucine and isoleucine under argon gas-cluster ion bombardment
Hubert Gnaser;
Hubert Gnaser
a)
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
and Department of Physics and Research Center OPTIMAS, University of Kaiserslautern
, D-67663 Kaiserslautern, Germany
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Masakazu Kusakari;
Masakazu Kusakari
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
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Makiko Fujii;
Makiko Fujii
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
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Toshio Seki;
Toshio Seki
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
and SENTAN, Japan Science and Technology Agency (JST)
, Chiyoda, Tokyo 102-0075, Japan
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Takaaki Aoki;
Takaaki Aoki
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
and SENTAN, Japan Science and Technology Agency (JST)
, Chiyoda, Tokyo 102-0075, Japan
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Jiro Matsuo
Jiro Matsuo
Quantum Science and Engineering Center,
Kyoto University
, Gokasho, Uji, Kyoto 611-0011, Japan
and SENTAN, Japan Science and Technology Agency (JST)
, Chiyoda, Tokyo 102-0075, Japan
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a)
Electronic mail: [email protected]
J. Vac. Sci. Technol. B 34, 03H102 (2016)
Article history
Received:
November 03 2015
Accepted:
December 21 2015
Citation
Hubert Gnaser, Masakazu Kusakari, Makiko Fujii, Toshio Seki, Takaaki Aoki, Jiro Matsuo; Secondary ion emission from leucine and isoleucine under argon gas-cluster ion bombardment. J. Vac. Sci. Technol. B 1 May 2016; 34 (3): 03H102. https://doi.org/10.1116/1.4939497
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