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Volume 31 (1983)
- Issue 4 Pages 231-
- Issue 3 Pages 165-
- Issue 2 Pages 97-
- Issue 1 Pages 35-
Volume 31, Issue 3
Displaying 1-6 of 6 articles from this issue
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Naoki Nose1983 Volume 31 Issue 3 Pages 165-172
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSNew time-of-flight energy analyzer for the fast neutral particles are described. The effect of the sweeping field on the ion packet length, the energy spread, and the direction divergency are discussed on the ground of experimental findings. Triple focusing conditions are given by combining the sweeping field with a sector type toroidal electric field. The toroidal field is realized by the application of the Matsuda plates which terminate a cylindrical condenser. A high resolution T-O-F analyzer is installed in the triple focusing geometry, and the time resolution of the analyzer is estimated to be 36,000.View full abstractDownload PDF (404K) -
Part I. New Time-of-Flight Energy Analyzer for the Determination of Scattering Angle of Neutral ParticlesNaoki Nose1983 Volume 31 Issue 3 Pages 173-182
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA new time-of-flight energy analyzer is developed for the determination of the very small scattering angle difference of product neutral particles in charge exchange collision process. The analyzer is essentially the Mattauch-Herzog type double focusing mass spectrograph combined a straight path tube for the fast neutrals as well as ions. Theory for the determination of scattering angle is developed, and a new time analyzer system is described. Experimental results on doubly differential cross section for Ar+- Ar collision system revealed that the new T-O-F analyzer is promising.View full abstractDownload PDF (458K) -
Part II. Experimental Studies on the Resolution of Time-of-Flight Analyzer and Proposal for the Focusing AnalyzerNaoki Nose1983 Volume 31 Issue 3 Pages 183-188
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA new time-of-flight analyzer is developed for the doubly differential cross section studies on charge exchange process. Experimental results for the limit of energy resolution revealed the incidental effects of the sweeping voltage. According to the time-depending ion optics, the incidental effect of sweeping field introduces the spreads in energy, direction, and length of the pulsed ion packet depending on the voltage as far as the slit widths are finite. An example for multi-focusing time-of-flight analyzer is proposed.View full abstractDownload PDF (244K) -
Hiroshi Ichikawa, Yukiko Nakajima, Alex G. Harrison1983 Volume 31 Issue 3 Pages 189-196
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSPotential energies of 1, 2 hydrogen shift in protonated fluoro- and chlorobenzenes were estimated by MINDO/3. The potential energy curves of the reaction, C6H5XH+ → C6H5+ + XH, were examined for × = H, OH, CH3, F, and Cl. It was found that there were two types of fragmentation, the reaction starting from ipso-protonation (X = H, CH3) and from substituent protonation (X = OH, Cl, and F). There were at least two minima of potential energy in the course of the HF elimination from F-protonated fluorobenzene. The high heat of formation for the F-protonated fluorobenzene suggested that there are two kinds of C6H6F+ ion, i. e., the ring-protonated fluorobenzene and the cluster ion consisting of the phenyl ion and HF. Difference of fragmentation between protonated fluoro- and chlorobenzenes has been discussed.View full abstractDownload PDF (480K) -
Hiroshi Seto, Taisuke Okuda, Tomoyuki Takesue, Tadashi Ikemura1983 Volume 31 Issue 3 Pages 197-203
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSNegative chemical ionization(NCI) mass Spectra of a number of nucleosides, halogenonucleosides and purine and pyrimidine bases have been studied using a H2/N2O mixed gas as a reagent gas. In most of the nucleosides, each base fragment ion (b)- peak was the strongest, (M-H)- ion peak was weak or non-existent, and a significant (b+O)- ion was found. It seems that formation of the (b+O)- ion roughly correlates to the LUMO energy of corresponding base. A group of low mass ions (m/z 71, 58, 45) which was attributed to the sugar moiety cleavage was clearly found in ribonucleosides, but not in 2′-deoxyribonucleosides. NCI spectra of the halogenonucleosides showed the prominent peaks of halogen ions (often the base peak). Molecular ion M- was formed from these halogenonucleosides. The process of negative ion production of nucleosides was discussed.View full abstractDownload PDF (368K) -
Tokishi Hayashi, Hiroshi Naruse, Yoshio Iida, Shigeki Daishima1983 Volume 31 Issue 3 Pages 205-212
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSVarious kinds of derivatizations of phenylalanine, tyrosine and the related compounds were investigated for detectability enhancement in NICIMS. For this purpose, certain kinds of fluorinated reagents were used, and the effective derivatizations of these compounds were established. The NICIMS using these derivatization seems to be very useful for not only in ultra-micro analysis but also in tracer experiments using stable isotope-labeled compounds.View full abstractDownload PDF (450K)
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