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Volume 21, Issue 6
Displaying 1-3 of 3 articles from this issue
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Toshiji NISHIJIMA1978 Volume 21 Issue 6 Pages 181-189
Published: June 20, 1978
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSAn apparatus which consists of a pulse-motor-driven goniometer, a U.H.V. chamber and oil free vacuum pumps has been successfully developed for channeling experiments in an ultra-high vacuum. The goniometer has three axis rotating mechanism of 0.005°/pulse and a movable sample holder which allows several samples to be replaced in a vacuum.
The whole system can be remotely operated at a pressure of 2.8×10-8 Torr. Slight out-gassing of those with mass number 36, 39, 41, 43, 57 and 77 from organic insulators of the goniometer are detected with a mass spectrometer. The amount of these gases, however, has been found not to be so large as to cause detectable surface contaminations during channeling backscattering measurements.View full abstractDownload PDF (1823K) -
Kenya AKAISHI, Akira MIYAHARA, Zensaburo KABEYA, Mutuo COMIZO, Tetsuji ...1978 Volume 21 Issue 6 Pages 190-195
Published: June 20, 1978
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSWith objection of absolute measurement of sputtering yield, the microbalance has been constructed. In the balance system, weight change was followed from observation of the deflection of the balance. The deflection was optically magnified and was converted to electrical output by means of a linear photopotentiometer. To the weaker deflection signal due to smaller weight change than the noise, separation of the signal from the noise was an important problem. Of the noises, the fluctuating noises were induced from 1) propagation of mechanical vibration (1070 Hz) to the balance and the optical alignment, and 2) propagation of sample oscillation to the balance (1Hz), and periodical thermal expansion or shrink of the optical alignment in the thermostatic room (0.02 Hz). The amplitude of fluctuating noises having higher frequency components than 1 Hz could be damped by a factor of 5 by the use of a low pass filter (cutoff frequency is 0.1 Hz). Then the amplifier gain to the deflection signal could be increased by a factor of 5. As a result of the improvement of S/N, the increase of the sensitivity from 5×10-7 g/mV to 7.3×10-8 g/mV was achieved. The minimum detectable weight change per hour was also reduced from 10-6 g/hr to 3.7×10-8 g/hr.View full abstractDownload PDF (1080K) -
Kazunori KOMORITA, Tatau NISHINAGA, Mituhiro NISIO1978 Volume 21 Issue 6 Pages 196-202
Published: June 20, 1978
Released on J-STAGE: September 29, 2009
JOURNAL FREE ACCESSIn order to investigate the oxidation process of evaporated Bi thin films, the time dependence of X-ray diffraction during the process was studied for the various oxidation conditions.
It was found that the diffraction intensity is proportional to the square root of oxidation time for a slow oxidation condition showing that the oxidation is controled by a diffusion process. However, it tends to saturate at the end of the oxidation. In the case of a fast oxidation, the saturation appears at much earlier time such as several ten seconds.
Bi2O3 film during the oxidation has a cubic structure which stands for a metastable phase (β'-phase). After a complete oxidation, the film begins to change to α-phase which has been known a low temperature stable phase.
All films as well as Bi films are found to be almost complete polycrystalline except a week (111) orientational growth.View full abstractDownload PDF (952K)
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