A selective multiphoton photochemical process has been used to enrich nitrogen-14 isotope in methylamine. A separation factor of two has been achieved for irradiation of CH/sub 3/N/sup 14/H/sub 2//CH/sub 3/N/sup 15/H/sub 2//NO sample with the P(24) line of the 9.6 ..mu.. CO/sub 2/ laser transition. The threshold laser energy fluence for reaction is roughly 30 joules/cm/sup 2/. The vibrational isotope shift of methylamine at 9.6 ..mu.. region was found to be 12.5 cm/sup -1/. The selectivity of the photochemical reaction appears to be limited by the overlap of vibrational-rotational lines of CH/sub 3/N/sup 14/H/sub 2/ and CH/sub 3/N/sup 15/H/sub 2/ molecules due to power broadening under the intense laser field.

The Antares laser will require that about 100 high-precision NaCl windows of 18-in. diameter be produced, maintained, and repaired. To aid the industry in achieving the required production rates, a polishing development program was undertaken by LASL's Laser Division in collaboration with the Air Force and International Laser Systems. The design and initial shakedown of the polishing machine is described. Preliminary results indicate the machine's design is sound, its operation is generally simple, and it should be capable of finishing 18-in. NaCl to better than lambda/2 visible and 20-10 surface. Shakedown work with glass has demonstrated 0-0 surface, complete absence of edge roll, and lambda/16 over 12 in., and lambda/6 over 19 in.

The primary purpose of the meeting was to familiarize large LMFBR design managers with the capabilities of the Inherent Secondary Shutdown Systems (articulated rod and absorber balls) and to obtain inputs from them. The other purpose of the meeting was for the ISSS designers (AI, GE, and WARD) to present current work status, future plans, and schedules for their respective ISSS tasks.

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