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Volume 30 (1982)
- Issue 4 Pages 281-
- Issue 3 Pages 219-
- Issue 2 Pages 129-
- Issue 1 Pages 31-
Volume 30, Issue 1
Displaying 1-6 of 6 articles from this issue
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ORIGINAL PAPERS
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Hu Zhao-Heng, Hisashi Matsuda1982 Volume 30 Issue 1 Pages 31-35
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSIon optics of various different types of mass spectrometers consisting of electric quadrupole lenses and magnetic field are proposed. Aberration coefficients (Aαα, Ayy, Ayβ, Aββ) and the width of magnet gap (g) are calculated and compared. High resolving power, high transmission and a narrow magnet gap can be obtained by mass spectrometers consisting of a pair of electric quadrupole lenses and a magnetic sector field. The apparatus with γm = 20 cm and 5 cm are discussed.View full abstractDownload PDF (276K) -
I. Construction and Utilization of the Data Base by BASIC LanguageYasuji Koyama, Isao H. Suzuki, Kogoro Maeda1982 Volume 30 Issue 1 Pages 37-53
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSMass spectral data of hydrocarbons from C1 to C50 were extracted for personal use from EPA/NIH Mass Spectral Data Base into floppy disks of a small computer system.
The extracted data are represented in six terms, compound name, molecular weight, chemical form, ionization method and mass numbers of molecular ion, if present, and its fragment ions and further CAS number. The mass numbers are taken for only maximum 10 or 13 peaks higher than 10 % to the base peak in the order of their peak heights. No exact peak height information is included.
Construction programs of the database and retrieval system are all described with extended BASIC language. Long period experience has proved that the system is convenient for data addition, amendment of the database, and also that the retrieves of the stored data can be made effectively without the peak height values. The most abundant base peak was m/z 43, and the number of molecules having the m/z 43 peaks as the base peak is 151. Even with this large number, only several compound names could be extracted as the candidates for the unknown samples having the m/z 43 base peaks from about the 1800 hydrocarbon data by keying 5 to 10 m/z values as the search peaks.View full abstractDownload PDF (1179K) -
Susumu Tajima, Kazuo Ogino, Tadashige Azami, Toshikazu Tsuchiya1982 Volume 30 Issue 1 Pages 55-59
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSThe amount of kinetic energy release accompanying the metastable ion reaction C7H7+ (m/z 91) → C5H5+(m/z 65) + C2H2 has been determined for 24 derivatives of toluene by scanning electric sector voltage of a double focusing mass spectrometer.
Except for the case of benzyl methyl ether and benzyl chloride, the determined values were nearly equal to those for the C7H7+ ions from toluene and isopropyl o-toluate, which are considered to produce the C7H7+ ion of tropylium ion structure.
From the profile of metastable ion peak, the mechanism of the fragmentation reaction C7H7I+· (m/z 218) → C7H7+ (m/z 91) + I · for m- and p-iodotoluenes has been estimated.View full abstractDownload PDF (319K) -
Shigeki Daishima, Yoshio Iida1982 Volume 30 Issue 1 Pages 61-69
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSCI spectra of all C10H14 alkylbenzenes, namely, four butylbenzenes (BB), three methyl-isopropylbenzenes (MIPB), three methylpropylbenzenes (MPB), three diethylbenzenes (MPB), three diethylbenzenes (DEB), six dimethylethylbenzenes(DMEB) and three tetramethylbenzenes (TMB), except 1,3-DM-2-EB were measured for the purpose of their isomeric classification, distinction and identification. Approximately 2 μg of each isomer in acetone was introduced into a Finnigan 3300 E GC/QMS equipped with a standard CI ion source via an OV-1 GC column. Methane (1.0 Torr) or isobutane (0.5 Torr) for reagent and carrier gas was introduced into the ion source maintained at 70°C. Methane CI spectra gave characteristic features for several alkylbenzene groups. Isomers could be classified as follows. Appearance of C4H9+ was characteristic to BB. MIPB and MPB could be distinguished from the remainders by the peaks of (M-41)+ and (M-13)+. MIPB and MPB could be distinguished from each other by the diffence of (M-41)+. TMB could be distinguished from DEB and DMEB by the peak of (M-27)+. The ion intensity of (M-29)+ served for distinguishing DEB and DMEB. Distinction of each isomer in DMEB and TMB was partly difficult. Isobutane CI spectra showed a considerable difference among alkylbenzene groups except BB and intergroup isomeric distinction and identification by comparing such peaks as (M-1)+, M+, (M+1)+ and (M+57)+ were easier than those performed by the methane CI spectra. Complementary results of methane and isobutane CI spectra enabled us grouping of C10H14 and isomeric distinction and identification of each alkylbenzene except 1,3-DM-4-EB and 1,4-DM-2-EB.View full abstractDownload PDF (435K) -
Wu Zhiru, Takekiyo Matsuo, Itsuo Katakuse, Hisashi Matsuda1982 Volume 30 Issue 1 Pages 71-79
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSIn this paper we describe an equipment to produce a number of emitters in a short time. The construction, electric circuit, vacuum system, used materials and notable points for manufacture are discribed in detail. Normally 48 emitters are produced at one time. Electron microphotographs of emitters taken under different conditions are compared and those after sample loading and ion emission are shown.View full abstractDownload PDF (871K) -
Itsuo Katakuse, Takekiyo Matsuo, Hisashi Matsuda1982 Volume 30 Issue 1 Pages 81-89
Published: 1982
Released on J-STAGE: May 01, 2007
JOURNAL FREE ACCESSField desorption mass spectrometry was applied to the analysis of tryptic and chymotryptic peptides of the duck egg white lysozyme C whose amino acid sequence was not known. Almost all mass peaks of the protonated molecular ions of the subpeptides in the digested peptide mixtures were observed. Comparing with the known sequence of lysozyme A, the sites and kinds of amino acid substitution in lysozyme C were studied.View full abstractDownload PDF (472K)
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