This paper presents detailed calculations of vibration—vibration transfer probabilities in CO–CO collisions including both long-range and short-range interactions. Comparison is made with experimental data, and the results show that the relative contributions of the long- and short-range interactions to the V–V transfer probability depend on energy defect and temperature. Our calculations match the experimental data at 300°K to within 25%; at this temperature the the short-range interactions dominate in determining the transition probability for vibrational energy defects greater than 210 cm−1, while the long-range interactions dominate for smaller defects.
A cw CO chemical laser has been operated with CS produced externally by a microwave discharge. Use of CS as a laser fuel produces large increases in output power, as compared with CS2, by a factor of 5.6 or more. The reasons for this power enhancement and the details of the experiment are discussed in this letter.
A chain-reaction CO chemical laser fueled by carbon monosulfide (CS) and molecular oxygen (O2) has been demonstrated. Initiation by the chain carriers (either O or S atoms) is necessary; the chain lenght λ* increases rapidly with the CS/CS2 fuel mole ratio, reaching a value λ*?10 at CS/CS2=1.57. Mass flow efficiencies up to 67 kJ/1b have been measured with a small-scale subsonic device, and laser operation has been observed up to 64-Torr cavity pressure. Gain measurements and subsonic mixing effects have been investigated. This work was made possible by developing a thermoelectric CS gas generator, which is also described.
This letter reports laser action in the visible (near 7000 Å) and near infrared on transitions of atomic fluorine. The pumping process is dissociative collisions of helium metastable atoms with hydrogen fluoride. Lower levels of the laser transitions are depopulated by both uv radiative transitions and in collision with ground-state hydrogen atoms.
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