Photodissociation of C₃H₅Br and C₄H₇Br at 234 nm

Abstract

The photodissociation dynamics of cyclopropyl bromide (C3H5Br) and cyclobutyl bromide (C4H7Br) at 234 nm was investigated. A two-dimensional photofragment ion-imaging technique coupled with a [2+1] resonanceenhanced multiphoton ionization scheme was utilized to obtain speed and angular distributions of the nascent Br( 2 P3/2) and Br * ( 2 P1/2) atoms. The recoil anisotropies for the Br and Br * channels were measured to be βBr = 0.92 ± 0.03 and βBr* = 1.52 ± 0.04 for C3H5Br and βBr = 1.10 ± 0.03 and βBr* = 1.49 ± 0.05 for C4H7Br. The relative quantum yield for Br was found to be ΦBr = 0.13 ± 0.03 and for C3H5Br and C4H7Br, respectively. The soft radical limit of the impulsive model adequately modeled the related energy partitioning. The nonadiabatic transition probability from the 3A' and 4A' potential energy surfaces was estimated and discussed.

Effect of Ga3+Doping on the Photoluminescence Properties of Y3Al5-xGaxO12:Bi3+Phosphor

“…Therefore the excitation and emission bands that are observed for Bi 3+ in the YAG, YAGG and YGG hosts can be attributed to 1 S 0 → 3 P 1 and 3 P 1 → 1 S 0 transition respectively. [1][2][3]21 The 29 nm shift in position from the excitation to the emission is due to the well-known Stokes shift. Additionally, the luminescence of Bi 3+ exhibited a red-shift with an increase in the Ga content inside the YAG host.…”

Dissociative Ionization and Coulomb Explosion of Molecular Bromocyclopropane in an Intense Femtosecond Laser Field

“…Kim et al have investigated the photodissociation of bromocyclopropane at 234 nm laser field using ion-imaging technique with the REMPI (Resonance-Enhanced Multiphoton Ionization) scheme. They infer that the non-adiabatic transition probability from the 3A′ potential energy surfaces was estimated to be 0.90 [12]. S. Pandit et.al.…”