On the role of iodine atoms in the production of if(B3Π) in fluorine atom/iodide flames

<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) …”

Rotational effects on the overtone-induced isomerization rate for CHD2NC .fwdarw. CHD2CN

“…These variations are somewhat smaller than those observed experimentally. The bandwidth of 0.01 cm"1 is the minimum spectroscopic bandwidth possible for a 6-Torr sample of this molecule on the basis of the pressure broadening of approximately 1 cm"1/atm observed in high-resolution fundamental spectra.31 At this narrow bandwidth, only [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] transitions contribute to the excited-state population. These calculations suggest that even significant variation of the excited distribution (major errors in the simulation) is unlikely to account for the discrepancy between calculations and experimental data.…”

“…Indeed, Zolotarev and co-workers have produced lasing from the IF(B) state by the optical excitation of IF(X) which was formed following the photolysis of CF3I/NF2/He mixtures.11,12 In a series of experiments by Raybone et al, various iodides were mixed with F atoms to yield IF(B) emission which was considerably enhanced by adding 02(' ) to the reaction flame. 13,14 The same group has also produced IF(B) emission by 248-nm photolysis of alkyl iodide/F2 mixtures. 15,16 From the results of these studies13"16 it has been suggested that IF(B) is formed either by the recombination of I*(2P1/2) and F atoms or by sequential excitation of IF(X) by I*.…”

Crossed-beam studies of some chemiluminescent reactions producing IF

“…The reactions F 2 + HI , CH 3 I , CH 2 12, CF 3 I have been studied by Estler, Lubman and Zare (3) under flow conditions, and their report is a very brief contribution to the General discussion of a Faraday Discussion. Many flow experiments have been done (17)(18)(19)(20)(21)(22) by the group of C. Whitehead, but the fluorine reactant was introduced in the atomic form, with only a small amount of fluorine molecules. This was also the case in a 1972 study by Schatz and Kaufman (8), and more recently in a work of Cha and Setser (23).…”