Violet emission of cyanogen produced in the reaction of argon(3P0,2) with cyanogen bromide. 1. Nascent vibrational and rotational distributions of CN(B2.SIGMA.+)

Abstract

The CN(B2Z+-X2Z+) emission spectrum, produced in the dissociative excitation reaction of BrCN with Ar(3Po,2) at thermal collision energy, was observed by using the flowing afterglow method. The effect of collisional relaxation of the excited electronic states of CN by the ground-state Ar atoms was minimized by lowering the ambient argon pressure to less than 10 mTorr. The "nascent" rovibrational distribution of CN(B2Z+) was determined by spectral simulation. A surprisal analysis of the nascent rovibrational distribution of CN(B2Z+) indicated that the dominant pathway of the reaction of BrCN with Ar(3Po,2) was energy transfer, instead of argon complex formation of ion-pair exciplex formation.

Mechanism of Nitrogen Incorporation into Amorphous-CNx Films Formed by Plasma-Enhanced Chemical-Vapor Deposition of the Doublet and Quartet States of the CN Radical

“…These anomalies have been explained by "intensity borrowing" due to the perturbation of the v = 6 level of the 4 state of CN as follows: 24,25,28) The rotational levels of B 2 + , v = 14 and 4 , v = 6 have accidentally the same energy at N = 7 and 10, where the wavefunctions for B 2 + and 4 are mixed due to the first-order spin-orbit interaction. Since the 4 state has a long radiative lifetime, τ ( 4 ) ≈ 35 µs, 26) the transition from 4 is actually "forbidden". However, this transition becomes "allowed" at N = 7 and 10 by borrowing the strong B 2 + -X 2 + transition moment through the perturbation between the B 2 + and 4 states.…”

“…[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] These studies have revealed that the CN radical produced in reaction (1) has the following characteristics: (a) a high efficiency and selectivity in the production of CN and (b) the production of metastable quartet states of CN. In particular, (b) is a special characteristic which is not observed in any other reaction to produce CN.…”

Analysis of Dissociative Excitation Reaction of Tetramethylsilane with Microwave Discharge Flow of Ar

“…In the MW discharge flow of Ar, metastable states of Ar, Ar( 3 P 0,2 ), Ar + , and free electrons may participate the dissociation of parent molecules [5][6][7]. The present study reports on the specification of the active species responsible for the decomposition of TMS based on the observations of the optical emission spectroscopy.…”

Dissociative Excitation Process of BrCN in the ECR Plasmas of Rare Gases

“…The dissociative excitation reactions of BrCN with rare-gas discharge flows have been known to produce the CN radicals with high efficiency [7][8][9][10]. We have applied these reactions to the synthesis of a-CN x and a-CN x :H thin films, where the microwave (MW) discharge flow of Ar [11][12][13][14][15][16][17][18][19] and the ECR discharge flows of Ar [20,21] and He [22] have been used.…”