Energy Transfer Kinetics and Dynamics of Relevance to Iodine Lasers
Abstract
Rate constants were measured for elementary reactions that are of importance for iodine chemical lasers driven by O2(a(sup 1) delta) (COIL) or NCl(a(sup 1) delta). Energy transfer between I(2 P(1/2)) and 02(X) has been studied in detail. Rate constants for electronic energy transfer and nuclear spin relaxation were measured over the temperature range from 150-300K. The mechanism for dissociation of 12 in COIL systems has been examined using kinetic models and experimental studies of I(sub 2)(A') collisional deactivation. A new model for the dissociation mechanism is presented. Quenching of NCl(a) has been characterized for the collision partners 02, Cl2, HCl, H2, 12, and CIN3. These measurements resolved serious discrepancies that had emerged from earlier investigations. Removal of NCl(a) by 12 was found to be a reactive process that liberates I atoms. The second order rate constant for self-annihilation of NCl(a) was measured using time-resolved fluorescence techniques. The value obtained, (7 +/-2))xlO(exp-13)cu cm/s(sup 1) is an order of magnitude slower than previous estimates. Detection of NCl(X) by means of the b-X absorption bands was demonstrated. Time-resolved absorption measurements were used to examine the kinetics of NCl(X) formation and decay.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 2001
- Accession Number
- ADA387548
Entities
People
- Michael C Heaven
Organizations
- Emory University