A Model for the 1612 MHz Masers in OH-IR Stars (13),
OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF
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Shklovsky 1966 first suggested that OH masers might be pumped by the absorption of infrared radiation. Subsequently, the physics of the pump process was investigated by Litvak 1969 and by Litvak and Dickenson 1972. The present paper attempts to bring into sharper focus the essential features responsible for the inversion of the 1612 MHz transition in OH-IR stars.