Iodine monofluoride B 3Π(0+)→X 1Σ+ lasing from collisionally pumped states

Abstract

An optically pumped IF laser operating on the B Jll(O+)-+X II + transition has been studied. Vibrational levels v' = I, 2, 3, 4, 5, and 6 of IF(B) were pumped by a dye laser pulse and lasing was observed both from the level pumped and from lower levels populated as a result of collisions with bath gas molecules. Time delays from 0.5 to 3.0 J.t s were observed between termination of the pump pulse on v' = 5 and lasing out of v' = O. The longer delays result from slower vibrational relaxation at lower pressures. The stable nature of v' = 0 reservoir indicates that the B -X electronic transition is very attractive as a potential chemical laser system.

Hyperfine constants of bromine and iodine monofluoride

“…There has been considerable recent interest in using the interhalogens, 19,20 particularly ClF ͑Refs. 21 and 22͒ and IF, [23][24][25][26][27] for lasers in the visible and UV regions.…”

The Production of IF(B3Π) in the248 nm Laser Photolysis ofFluorine/Alkyl Iodide Mixtures

“…31 If as suggested above, it is the supply of F atoms via reaction (2) that determines the IF(B) decay time, then we would expect the fastest rate to be associated with the shortest period for IF(B) emission. For the family of reactions R + C12, the relative rate constants are in the ratio 1:5:11 for R cn3, C2H5 and t-C4H9, 3 respectively, and for the reactions R + Br2, the rate constants are in the ratio 1:0.26:0.38 for R CF3, C2F5 and n-C3F7, 3 respectively, showing a correlation of faster R + X2 rate with shorter IF(B) half-life.…”

<title>Potential IF chemical laser</title>

“…The 10 j.ts radiative lifetime and the acceptable value (0,1995) of the Franck Condon factor [1] for the transition IF B 311(0+), v'=O --> IF X1, y't5 &e favorable values, so that a laser effect can be expected if a population inversion can be achieved by chemical pumping. Davis [2] has already demonstrated a laser effect in the red band by optical pumping on electronic transitions between IF B H(O) and IF Raybone [3,4] proposed a method for producing IF B H(O) from excited atomic iodine I (2 P 1/2 and atomic fluorine in the ground state F (2 P 3/2) A three-body process (1) and a two-stage mechanism (2a) et (2b) are involved. I(2P1/2)+F(2P3/2)+He ---> IFB3H(O+)+He (1) …”