Dissociation of I₂and the vibrational kinetics in the oxygen-iodine medium

Discharge production of the singlet delta oxygen for an iodine laser

“…According to [28,29] the energy exchange between different electronic terms is rather sensitive to the exact vibrational states of collision partners. Moreover, vibrational kinetics seems to be important in the processes of molecular iodine dissociation taking place in an oxygen-iodine mixture serving as an active medium of the laser [30]. All these facts emphasize the necessity of studying in more detail the kinetics of electronic and vibrational levels separately.…”

I2 Dissociation Mechanisms In the Chemical Oxygen-Iodine Laser Revisited Using Three- And One- Dimensional Computational Fluid Dynamics Modeling

“…In the HLAHP mechanism, iodine dissociation involves at least three steps where O 2 (a) is consumed (Table I lists the reactions considered in the modeling and their rate constants): 5,7,8 firstly in reactions that lead to production of O 2 (a, v) by the O 2 (a) energy pooling (reactions 15 and 16) and O 2 (b) quenching by water (reaction 17), secondly in I 2 (X) (≡I 2 (X ) 1 + ∑ g ) excitation to I 2 (A', A) (≡ I 2 (A' 3 Π 2u , A 3 Π 1u )) by energy transfer from O 2 (a, v) via reactions [11][12][13] and thirdly in I 2 (A', A) dissociation to I atoms via interaction with O 2 (a) (reaction 14). At the later stage of dissociation, when a substantial number of I (≡ I( 2 P 3/2 )) atoms is formed, an additional three step dissociation mechanism takes over as shown in the schematics presented in Fig.…”

Comparing modeling and measurements of the output power in chemical oxygen-iodine lasers: A stringent test of I2 dissociation mechanisms

“…13 ͑Table I lists the reactions considered in the modeling and their rate constants͒. Iodine dissociation is initiated by a mechanism which requires at least three steps where O 2 ͑a͒ is consumed: 7,9,10 first in reactions that lead to production of O 2 ͑a ,v͒ in the course of self-quenching of O 2 ͑a͒ ͓O 2 ͑a͒ +O 2 ͑a͔͒ and the pooling reaction between O 2 ͑a͒ and I ‫ء‬ ͓formed in reaction ͑3͔͒, which is important even at the initiation stage when the dissociation fraction of I 2 and hence the density of I ‫ء‬ is small, second in the excitation of I 2 ͑X͒ to I 2 ͑AЈ , A͒ by energy transfer from O 2 ͑a ,v͒, and third in the dissociation of I 2 ͑AЈ , A͒ to I atoms via interaction with O 2 ͑a͒. At the later stage of dissociation, when a substantial number of I atoms is formed, an additional three step dissociation mechanism takes over.…”

“…Hence, model predictions of the COIL output power depend on the mechanism of I 2 dissociation in the COIL employed in the modeling. Despite many efforts [4][5][6][7][8][9][10][11][12][13] the dissociation mechanism is still not well understood. There are two main mechanisms that are currently in use.…”