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Volume 18, Issue 9
Displaying 1-8 of 8 articles from this issue
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Hiroshi HARA1990 Volume 18 Issue 9 Pages 711
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (90K) -
Teruaki MOTOOKA1990 Volume 18 Issue 9 Pages 712-723
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe photolysis of dimerized trimethylaluminum, Al2 (CH3) 6, (TMA) by excimer laser irradiation was investigated. The valence electronic structure of TMA was determined by photoelectron spectroscopy and molecular orbital (MO) calculations. On the basis of time-resolved optical emission spectroscopy combined with MO calculations, a model for the UV photolysis of Al2 (CH3) 6 was developed, in which Al and CH were produced in the gas phase through cascade one-photon absorption processes in Al2 (CH3) 6 and Al (CH3) n (n = 1, 2, 3). High-resolution electron-energy-loss spectroscopy (HREELS) was also used to study the adsorption and UV-laser-induced dissociation of TMA on the Si (100) 2 × 1 and Si (111) 7 × 7 surfaces. HREELS spectra from TMA single adlayers were consistent with those expected for nondissociatively adsorbed TMA dimers. No changes in the adlayer spectra were observed under KrF laser irradiation, while ArF laser irradiation caused the dissociation of adsorbed TMA and the desorption of some methyl ligands.View full abstractDownload PDF (1356K) -
Masahiro TSUKAMOTO, Ryosuke KODAMA, Masataka KADO, Hajime ITO, Masaki ...1990 Volume 18 Issue 9 Pages 724-731
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe have developed a monitoring system for the real-time characterization of cryogenic fuel layer in laser-fusion targets. This system is composed of an imaging interferometer, in addition to a normal target postion monitor with a single optical path. The fabrication process of a solid fuel layer in a plastic spherical shell is observed with this system. Solid fuel layer uniformity is displayed as concentric interference patterns. The distortions of the interference patterns can be interpreted as fuel layer nonuniformities.View full abstractDownload PDF (917K) -
Energy Structure and Excitation-Relaxation Processes in SF6Iwao KITAZIMA, Hironobu KINOSHITA, Koichi HATTA, Zenshiro OKAI, Hirosh ...1990 Volume 18 Issue 9 Pages 732-740
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe CARS (Coherent Anti-Stokes Raman Scattering) spectra and intensities were observed for SF6 (20-600 Torr) after pumped by a CO2 laser pulse. The fundamental (ν1) band at 774cm-1 was quenched after the IR excitation. while the hot bands coupled with the ν4, ν5 and ν6 states at 771-773cm-1 were enhanced. The low intensity broad band at 766-770cm-1 attributed to the quasicontinuum was also enhanced. The additive gases, such as He, Ar, N2, CO2, and Xe, increased the intensity of either the fumdamental band or the hot bands. However, the CO2 additive hardly enhanced the hot bands so that the vibrational energy of the coupled (ν1+ν4, ν1+ν5) modes in SF6 should be resonantly transfered by the collisions to the CO2 (100, 020) states. After pumped by the IR laser, the enhancement of the hot bands decreased with a decay time of 16 μs, while the quenching of the fundamental band occurred with a decay time of 30μs, depending on the collisional condition with additive gases.View full abstractDownload PDF (1080K) -
Teruhiro SHIONO, Kentaro SETSUNE, Kiyotaka WASA1990 Volume 18 Issue 9 Pages 741-754
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSReflection micro-Fresnel lenses and their application to an integrated optical-disk pick-up are proposed. Theoretical analysis indicates that the optical characteristics of reflection micro-Fresnel lenses can be improved compared with a conventional transmission micro-Fresnel lens. These reflection micro-Fresnel lenses were fabricated using electron-beam lithography and exhibited diffraction-limited focusing characteristics with 71% high efficiency. The pick-up has a folded optical path and includes a beam splitter integrated with thin film components, such as a reflection elliptical micro-Fresnel lens and a quadrant photodetector. The reflection elliptical micro-Fresnel lens in the pick-up exhibited excellent astigmatic characteristics in good agreement with theoretical results, and a focus error signal was also detected.View full abstractDownload PDF (2016K) -
Kazuo TAKEUCHI, Kei SUNOUCHI1990 Volume 18 Issue 9 Pages 755-760
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA method is presented for the quantitative evaluation of the reactor utilization factor for laser isotope separation, in a compartments-in-series type reactor in which a laser beam is focused at the center of each compartment. We show that the maximum process flow rate for this reactor is obtained as the product of this factor with the flow rate for an ideal reactor that uses a parallel beam. An example of the evaluation of this factor is given for a CTF3/CHF3 system.View full abstractDownload PDF (585K) -
Kei SUNOUCHI, Hiroshi KOMIYAMA, Kazuo TAKEUCHI1990 Volume 18 Issue 9 Pages 761-763
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (211K) -
1990 Volume 18 Issue 9 Pages plate1
Published: September 29, 1990
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (2476K)
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