All issues
Volume 19 (1971)
- Issue 4 Pages 254-
- Issue 3 Pages 179-
- Issue 2 Pages 88-
- Issue 1 Pages 1-
Volume 19, Issue 3
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
KUMASABURO KODERA, ISAO KUSUNOKI, ATSUHIRO SAKIYAMA, YOSHIHIKO KAWAI1971 Volume 19 Issue 3 Pages 179-193
Published: September 29, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMeasurements of total collision cross sections by means of molecular beams, especially on the scattering of alkali atoms by various gases, arereviewed, and the problems in the measurements are discussed in detail. In this part, the correction terms for the thermal motions of the target gases are calculated and the angular resolution for the detection of the beam deflected into small angles is re-examined theoretically. In addition, the velocity dependence of the total cross sections and the glory effects are discussed.View full abstractDownload PDF (1426K) -
MICHI ARATANI, NOBUFUSA SAIT1971 Volume 19 Issue 3 Pages 195-203
Published: September 29, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMass spectrometric studies using solid radioisotopes as an ion source have been made in a pulse counting mode with 16-stage electron multiplier. Two kinds of ion sources using241 Am have been constructed according to the fact that an alpha emitter, when it decays, produces two kinds of energetic particles:an alpha particle and a recoil atom.One is a recoil ion source which makes it possible to observe charge states of recoil ions. The other is a sputtering ion source which makes it possible to detect ions“in situ”wher eand when they are just produced in a solid phase. Results with the recoil ion source have shown that+5-charged ions are the most abundant in case of237 Np from241 Am. A discussion has been made in comparison with results from Mossbauer spectroscopic studies. Both Pd metal layer and cellulose nitrate film have been examined by means of the sputtering ion source. Mass spectra and charge spectra obtained have been discussed in connection with track formation mechanism through passage of energetic particles in a solid phase.View full abstractDownload PDF (896K) -
HIROSHI NISHIMURA, TATEKI FUJIWARA, JUN OKANO1971 Volume 19 Issue 3 Pages 205-212
Published: September 29, 1971
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSAn energy selector was attached to a double focusing ion probe mass spectrometer in order to improve the detectable limit for trace component analyses. The detectable limit of boron in silicon was about 100 times as low as that obtained without it and found to be about 40 ppb. By the use of the improved apparatus, the relative production rates of the multiply-charged ions were investigated for carbon and silicon. Under the normal instrumental conditions, the ratios of C2+/C+and Si4+/Si+were found to be3.6×10-6 and 5.9×10-7, respectively.View full abstractDownload PDF (421K) -
FUMIYA KONISHI, NOBUO NAKAMURA1971 Volume 19 Issue 3 Pages 213-216
Published: September 29, 1971
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe mass response of Ilford Q 2photographic plate sensitivity to singly charged ions has been investigated by using 16 keV ions of 7 elements with the mass number ranging from6through 198. Exposure(Em1)for a singly charged ion only was calculated from the exposure(Em)measured by the monitor electrode placed at the entrance of the magnetic field by eliminating the contribution by doubly charged ions which are simultaneously measured by the monitor and by taking into account the isotopic abundance. Correction was also made for the line width. Logarithm Em1was plotted against logarithm Seidel function(Δ)calculated from transmittance measurements made on suitably exposed spectra. The relative value of the mass response is the reciprocal of the value of E atΔ=0. The mass response of the Q 2 emulsion sensitivity was found to decrease with 0.4 th power of the ion mass. Disagreement with Owens'value of 0.5 and apparent good harmony with the values obtained by Woolston et al. are considered.View full abstractDownload PDF (278K) -
MASAHIKO TSUCHIYA, TADASHI SAKURAI, SADAO MARUYAMA, J. Svec1971 Volume 19 Issue 3 Pages 217-223
Published: September 29, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWe built a double-beam mass spectrometer whose ion source has a dual parallel electron beams which are only 5 mm apart and variable in their energy, 0∼150eV. This instrument is useful to detect not only ionic fragments but also neutral species and excited molecules(or atoms)produced by electron impact. This paper describes the highly excited Ar, whose threshold energy is about 15.6 eV. It was found that this excited Ar had long life-time more than 10-5 sec, getting through the repeller net and ionizing chamber as a neutral with its thermal energy and was ionized by the effect of ion accelerating field, namely field ionization. Theoretical consideration was also discussed.View full abstractDownload PDF (521K) -
(I)On-line Data Reduction System for GC/MSMAKOTO NOSHIRO, SHOJIRO GOTO, YONEZO AKATSUKA, RYOJI YAMAGISHI, NORIYA ...1971 Volume 19 Issue 3 Pages 225-234
Published: September 29, 1971
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSThe full automatic system including data acquisition and processing for GC/MS was constructed, and its applicability was studied. The mass spectrometer(Hitachi RMU 6-E single-focusing)and a small computer(JEOL JEC-5)with 4 k words of 16-bit length and with a 2-channel 8-bit A-D converter were adopted. So as to scan successively and automatically, GC/MS was partially modified by introducing the meter relay units and a solenoid valve. The electric out-put of mass spectrometer is digitized at a rote of 4500 points per sec. while the spectrometer scans in the range m/e 0-600 in 5 sec., and the data are punched out immediately as a tape in a few sec. in order to save core memory. The computer reads the tape, calculates m/e values, normalizes the intensities, and prints out the mass spectra in digital form. M/e values were correct up to 300, and the pattern coefficient was quite similar to that of the visicorder, and these values were suitable for further processing such as searching the standard files of mass spectra. This system with automatic scanner enables us a full automatic data reduction for GC/MS method.View full abstractDownload PDF (830K) -
(II)Identification of Mass Spectra in a CatalogYONEZO AKATSUKA, SHOJIRO GOTO, MAKOTO NOSHIRO, RYOJI YAMAGISHI1971 Volume 19 Issue 3 Pages 235-242
Published: September 29, 1971
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIdentification of mass spectra by searching a file of known spectra employing the computer (IBM360/44)was discussed. Mass spectra of about 6000 compounds were stored into a disk. To take an advantage of random access for the disk, 50 similar spectra for each unknowns are sorted by pre-search using the 7 strongest peaks, and then the more similar ones are searched from them using the 10 strongest peaks. The names and chemical formulas are printed out with the similarity index in decreasing order down the list, and mass spectra of unknown compounds and searched ones are plotted by computer if desired. Time taken for the identification of an unknown was reduced to about a minute by reading in up to 10unknowns at once and keeping separate lists for each comparison. This sytem combined with GC/MS on-line data reduction system allowed in principle automatic compound identification.View full abstractDownload PDF (597K) -
1971 Volume 19 Issue 3 Pages 243-245
Published: September 29, 1971
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (333K)
- |<
- <
- 1
- >
- >|