| 摘要 |
PURPOSE:To sufficiently utilize the benefit obtained by the use of an ultrasonic nozzle and to prevent the damage of an optical window, by allowing two or more kinds of laser beams different in a wavelength irradiating a working substance to cross each other. CONSTITUTION:Two kinds of infrared laser beams 2, 3 different in a wavelength are allowed to irradiate the working substance in an ultrasonic nozzle 1 in such a state that the optical axes thereof cross each other at a right angle. The overlapped part of the laser beams 2, 3 is limited to the central part of the nozzle 2 and no dissociation reaction is induced in the vicinity of the inside part of optical windows 4, 4' permitting the transmission of the laser beams 2, 3. As a result, since no infrared multiple photo dissociation is induced in the gaseous working substance not supercooled in the vicinity of the inner wall of the ultrasonic nozzle 1 or low pressure reaction container 7, the benefit obtained by the use of the ultrasonic nozzle 1 can be sufficiently obtained. Further, since it is avoided that highly intensity infrared laser beam is applied to the optical windows 4, 4', the damage of the optical windows 4, 4' can be prevented.
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