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30 JANUARY 1959 239

30 JANUARY 1959 239

One method of producing free radicals is by flowing gases through a high-frequencyelectric discharge. The radicals are pumped into the Dewar flask and frozen solid.

New design for free-radical productionRAYTHEON'S 800-WATT POWER GENERATOR ONF. C. C. -ALLOCATED FREQUENCY, 2,450 MC

A completely packaged unit, the PGM-100Microwave Power Generator is designed to filllaboratory and industrial requirements forhigh-power breakdown of gaseous moleculesand excitation of electrodeless light sources.

Adjustable from 250 to 800 watts, this fixed-frequency, air-cooled generator supports dis-charges at higher pressures than previous units.

SPECIFICATIONS:

Power Output:.........800 watts (average); StandardJAN waveguide RG 104/U

Frequency: ............ 2,450 Mc + 25 McPower Input:............ 230/115V ± 10%; 3 wire 60

cycles; single phase, 20 amps.Power Adjustment: .... 250 to 800 wattsMaximjum VSWR:. 4/1 (Mismatched loads)

Excellence (

The unit's high power suggests its use in pro-ducing greater yields of excited free radicals, aswell as atoms at advanced levels of ionization.

If you are now at work in atomic or molecularresearch, or in precision optical measurements,we will be glad to discuss your projects andyour needs with you. For further information,simply fill out and mail in the coupon.

) in Electronics

SCIENCE, VOL. 129240