All issues
Volume 31 (1983)
- Issue 4 Pages 231-
- Issue 3 Pages 165-
- Issue 2 Pages 97-
- Issue 1 Pages 35-
Volume 31, Issue 1
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
REGULAR PAPERS
-
Toku Sasaki, Keizo Morikawa1983 Volume 31 Issue 1 Pages 35-43
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe ion-optical configurations of the narrowest image width are examined in the case of two homogeneous magnetic fields by numerical calculations. The image width W is a function consists of 10 variables which characterize each field and 8 constants which represent the system dimensions and ion beam properties. Particularly, the free-space distances between two magnetic fields d and the one between the second magnetic field and the image l″ are determined by the double focusing conditions, where a practical point of view for the construction is considered.
The functional behavior of W, d and l″ are investigated as a function of 10 variables. It is clarified that the function W has sharply pointed minima for all variables, and that there are many cases that the increse of W at minima with the change of some variable is compensated by the change of another variable. This compensating property is also the case for d and l″.
Based upon these facts, it is possible to decide a suitable configuration realizing an image of width about 0.2 micron with easier construction and adjustment.View full abstractDownload PDF (533K) -
Tatsuo Arikawa1983 Volume 31 Issue 1 Pages 45-50
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSElastic differential cross sections for the system of argon ions-methane molecules have been measured using a crossed-beam apparatus at laboratory energies from 20 eV to 80 eV over the laboratory scattering angles from 2° to 15°. Oscillatory structues which are superimposed on the monotonically decreasing function due to the elastic scattering have been observed in the differential cross sections as usually observed in a symmetric electron transfer process such as helium ions by helium atoms or argon ions by argon atoms. These oscillations are not prominent as compared with those of symmetric cases, but they may still be considered as a result of the interference between the two waves scattered from symmetrical and antisymmetrical potentials of argon-methane pseudo-molecular ions. A qualitative interpretation of this mechanism will be presented in terms of the Jahn-Teller effect.View full abstractDownload PDF (382K) -
Susumu Tajima, Tadashige Azami, Toshikazu Tsuchiya, Nico M. M. Nibberi ...1983 Volume 31 Issue 1 Pages 51-54
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe amount of kinetic energy released in the metastable ion reaction M+ → [M-NO]+ + NO· has been determined for several substituted nitrobenzenes by scanning the electric sector voltage of a double focusing mass spectrometer. The order of the amount of kinetic energy release is para > ortho > meta for substituted nitrobenzenes having an electron donating substituent, whereas the order is meta > ortho > para in the case of an electron-withdrawing substituent. These observations have been rationalized in terms of the stability of the generated [M-NO]+ ion and of the transition state ring size of the reaction.View full abstractDownload PDF (225K) -
Kimio Isa, Yayoi Yamada1983 Volume 31 Issue 1 Pages 55-60
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe metal substitution reaction of complexes was studied in the case of bis (dimethylglyoximato) metal complexes by means of electron impact mass spectrometry. The reaction schemes were described below,
M(dgH)2 + NXn → N(dgH)2 + M2+ + nX-
where M and N denote each of Ni, Cu and Pd, and dgH denotes dimethylglyoximato, and X- denotes each of Cl-, SO42-, NO3- and CH3COO-.
In the case of bis (dimethylglyoximato) copper (II), Cu (dgH)2, the molecular ion could not be observed because of thermal decomposition, but in the cases of bis (dimethylglyoximato) nickel (II) and bis (dimethylglyoximato) palladium (II), the molecular ions could be detected easily. Metals of Ni (II) and Cu (II) of bis (dimethylglyoximato) nickel (II) and bis (dimethylglyoximato) copper (II), respectively, could also be replaced easily by metal Pd (II) of PdSO4. Using all PdXn salts, the metal Pd (II) coule be replaced easily by metal Ni (II) of bis (dimethylglyoximato) nickel (II). The strongest signal of Pd (dgH)2 could be obtained in the ease of sulfate and the weakest signal could be obtained in the case of nitrate. Reaction step of metal substitution may involve the existence of Pd (dgH)2 in the solid phase.View full abstractDownload PDF (347K) -
Hiroshi Ichikawa, Yukiko Nakajima, Alex G. Harrison1983 Volume 31 Issue 1 Pages 61-72
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSUsing STO-3G geometry optimization was carried out on the benzenium ion and p- and F-protonated fluorobenzenes. Electronic structures, geometries, and heats of formation of protonated phenol, toluene, aniline, benzaldehyde, benzonitrile, fluorobenzene, and chlorobenzene were obtained by MINDO/3 and compared in an attempt to explain absense of C6H5+ ion in chemical ionization mass spectra of benzaldehyde and benzonitrile. The unstability of N-protonated aniline has been interpreted in terms of breakage of the conjugation between lone pair electrons and π-electrons.View full abstractDownload PDF (675K) -
Shigeki Daishima, Yoshio Iida1983 Volume 31 Issue 1 Pages 73-80
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSA simple method for detection and identification of alkylbenzenes was attempted for gasoline, kerosine and industrial grade alkylbenzene mixtures by using GC/CIMS. About 1 μl of each sample was introduced into a Finnigan 4023 GC/MS/DS equipped with an OV-101 capillary column (0.28 mm i. d. ×20 m or 0.25 mm i. d. ×50 m). Methane was used as a reagent gas. The ion source pressure and temperature were maintained at 0.20 Torr and 250°C, respectively. The mass fragmentograms were recorded at the 20-25 characteristic masses, as m/z 79, 91, 92, 93, 105, 106, 107, 119, 121, 133, 135, 147, 149, 161, 163, 175, 177, 189, 191, 203, 217, 231, 245, 259, 273, corresponding to quasi-molecular ions, (M±H)+, molecular ions, M+, fragment ions, (M-CmHm-1)+ and ions formed by olefin displacement reactions, (M-CmH2m-1)+. The alkylbenzenes were detected selectively by this technique for the sample of gasoline and kerosine. Reconstructed ion chromatogram which was obtained by summing up all of the mass fragmentograms contained only the signal of the alkylbenzenes. Although the identification of each alkylbenzenes was difficult, the estimation of the molecular weights was much easier by CI than EI for the sample of industrial alkylbenzene containing branched chain type compounds. Each alkylbenzene could be identified completely in a sample containing straight chain type compounds. In general, it was found that the compounds of C7H8 to C10H14 were possible to be identified by mass fragmentography without the standard samples. For alkylbenzenes of C11H16 and later ones, the estimation of the molecular weights and the classification of groups of isomers were possible by the present method. For example, they were pentylbenzene, methylbutylbenzene…… pentamethylbenzene in the case of C11H16.View full abstractDownload PDF (432K) -
István Cornides, László Morvay1983 Volume 31 Issue 1 Pages 81-86
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSMass spectrometric investigations of the carbon polymers revealed important facts about the vaporization of graphite and initiated the high temperature MS studies of a great number of materials. By measuring the abundance distribution of the doubly charged species Cn2+, we have completed the earlier investigations and also have found necessary to refine the quantumchemical theory of the carbon polymers.View full abstractDownload PDF (333K) -
Minoru Sakairi, Hideki Kambara1983 Volume 31 Issue 1 Pages 87-95
Published: 1983
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSAn interface for liquid chromatograph/mass spectrometer (LC/MS) using atmospheric pressure ionization (API) coupled with a nebulizing sample introduction system is mounted on a single focusing mass spectrometer. Many kinds of nonvolatile compounds are investigated. Comparison between API and chemical ionization (CI) and/or molecular secondary ion mass spectra are carried out. It is demonstrated that a few ng sample can be detected in this LC/APIMS system.View full abstractDownload PDF (516K)
- |<
- <
- 1
- >
- >|