The measurement of gain on the 1.315 μm transition of atomic iodine in a subsonic flow of chemically generated NCl(a1Δ)

Recent Progress in the Development of a Multi-Watt All Gas-phase Iodine Laser (AGIL)

“…The Cl / HN 3 stoichiometry suggests that the optimum 28 condition for NCl(a'A) production is HN 3 = 0.5C1 = NF 3 , and our result is a factor of 2 too -4-American Institute of Aeronautics and Astronautics large. This is not a surprising result considering that Herbelin 24 and Henshaw 23 reported a very similar trend for AGIL 1. Their optimum F : HN 3 ratios for gain/lasing power were 2.3 and 1.9, respectively.…”

“…Small signal gain measurements were performed as previously described by Herbelin, et. al 24 . Table 1 values multiplied by 4.…”

Temperature dependence of the Cl+HN3 reaction from 300 to 480 K

“…2 analysis of the data using the collision theory expresfrom the data reported in Ref. [1], and excellent sion, AT(' 5 exp(-Eo/RT), results in a satisfactory agreement is achieved. fit with A=1.2±0.5X10- order of a few hundred calmol-1.…”

“…by reactions (1) and (2): The recent report of a direct measurement of gain [1] on the I(-p1/2-2 P 3 / 2 ) transition in the Cl + HN 3 -HCl + N 3 NCI(a'A)/I chemical system has increased interest C + N3 -NCIaA, b X 3 1) + N 2 (2) in the use of metastable nitrene halides (NX) as energy donors for iodine-based chemical lasers analThe A H0° value for reaction (1) is -9.3 kcal mol-1, ogous to the chemical oxygen iodine laser (COIL) and the enthalpy for reaction (2) is -39, -22, and [2,3]. There are several important advantages and -65 kcal mol'-for generation of the (a'A), (b'l + disadvantages to the use of these molecules, which and (X 3 ý -) states, respectively, using A H 1°( NC1) = are isovalent with 02.…”

“…The most obvious advantage 77.4 kcalmol-' [14]. The rate determining step for is generation of the (a 1 A) states in the gas phase this process is reaction (1), which has a room tem- [4][5][6][7][8][9][10] rather than the mixed gas/aqueous chemistry perature rate coefficient [15] hand, the NX(a'A) molecules are much more reactransition was achieved when a small flow of HI is tive than 0 2 (a6A) [11][12][13] CF 3 I in 12 L bulbs. The flow rate of HCl was stored in a stainless steel vessel.…”