Generation of high-number densities of iodine monofluoride in a supersonic flow

Abstract

Iodine monofluoride, a promising visible chemical laser candidate, has been chemically produced at number densities exceeding 1×1015 molecules/cm3 in a supersonic flow. Combustion of nitric oxide and molecular fluorine produced atomic fluorine at an efficiency of 20%–30%, independent of flow conditions. The subsequent transonic reaction of atomic fluorine with molecular iodine to produce a stable flow of IF(X1Σ+) was mixing limited and complete within 10 μs. The low-pressure (3 Torr), low-temperature (300 K) flow environment should be suitable for lasing.

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

“…RRKM Simulations The rate constant for each J,K state was calculated using the RRKM formalism. In RRKM theory the reaction rate constant, k(E), for a molecule with an amount E of internal energy is given by k(E) = n*(E-E0)/hp(E) (5) where p(E) is the density of quantum states in the reactant at energy E, W*(E -E0) is the sum of states available in the transition state with energies between zero and E -E0, and h is Planck's constant. This equation is the standard RRKM expression for the rate constant.…”

“…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.…”

Modeling of the chemical generation of atomic iodine in a chemical oxygen-iodine laser

“…It can be seen that the reaction time for reaching the maximum conversion is approximately two times longer in comparison with F atom generation. It could be ascribed to the additional process producing I atoms in reaction (11).…”