FD09		15min10:59

YEVGENIYA I. GERHANOVICH, JULANNA G. GILBERT, Department of Chemistry, University of Denver, Denver, CO 80208.

The reaction of NFCl₂ with metastable argon atoms was investigated. When NFCl₂ was admitted to a stream of argon metastables (³P₂), visible and UV emission was observed. Two sources of the visible emission were identified. A sharp peak at 528 nm was assigned to the v=0 sequence band of the b¹⁺->X^3- transition in NF, and a peak at 664 nm was assigned to the v=0 sequence band of the b¹⁺->X^3- transition in NCl. The v= -1, +1, +2, and +3 sequence bands of the NCl b->X transition were also observed with up to v/=12 levels populated. The vibrational excitation in the NF and NCl fragments has implications for the geometry of the excited state of NFCl₂ formed in the Ar(³P₂)+NFCl₂ reaction . The UV emission spectrum consisted of two bands with maxima at 256 nm and 198 nm. The intensity distribution of the UV emission was identical to the emission that was observed when Cl₂ was added to the stream of argon metastables and was assigned to electronically excited Cl₂ formed via Cl₂ +Ar(³P₂). The source of the Cl₂ is either Cl₂ contamination in the NFCl₂ sample, or Cl₂ formed during the reaction of NFCl₂ with Ar(³P₂). To examine the energetics of the NFCl₂+Ar(³P₂) reaction, G1 and G2 methods were used to calculate the H_form of NFCl₂.