Abstract
The photodissociation dynamics of CF2Br2 has been studied using a two-dimensional photofragment ion image technique for the two excitation wavelengths 234 and 265 nm. At 234 nm, three dissociation channels, i.e., the radical CF2Br + Br (2PJ) (J = 1/2, 3/2), the three-body CF2 + 2Br (2PJ) (J = 1/2 3/2), and the molecular elimination channel CF2 + Br2, were observed with quantum yields of 0.84, 0.15, and trace, respectively. The difference between β (CF2Br + Br (2P3/2)) = 0.65 and β (CF2Br + Br (2P1/2)) = 0.80 suggests that the excited A1 and B1 states are strongly correlated by avoided curve crossing with a probability of 0.78. At 265 nm, the radical channel, the observed major primary dissociation channel, shows several components due to the transition close to the curve crossing point. On the basis of observations at both wavelengths, we have proposed a photodissociation dynamics model of CF2Br2 after A-band excitation.
| Original language | English |
|---|---|
| Pages (from-to) | 5606-5612 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry A |
| Volume | 105 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2001 Jun 14 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
Cite this
}
Avoided curve crossing between the A1 and B1 states in CF2Br2 photolysis at 234 and 265 nm. / Park, Moon Soo; Kim, Tae Kyu; Lee, Sung Hae; Jung, Kyung Hoon; Volpp, Hans Robert; Wolfrum, Jürgen.
In: Journal of Physical Chemistry A, Vol. 105, No. 23, 14.06.2001, p. 5606-5612.Research output: Contribution to journal › Article
TY - JOUR
T1 - Avoided curve crossing between the A1 and B1 states in CF2Br2 photolysis at 234 and 265 nm
AU - Park, Moon Soo
AU - Kim, Tae Kyu
AU - Lee, Sung Hae
AU - Jung, Kyung Hoon
AU - Volpp, Hans Robert
AU - Wolfrum, Jürgen
PY - 2001/6/14
Y1 - 2001/6/14
N2 - The photodissociation dynamics of CF2Br2 has been studied using a two-dimensional photofragment ion image technique for the two excitation wavelengths 234 and 265 nm. At 234 nm, three dissociation channels, i.e., the radical CF2Br + Br (2PJ) (J = 1/2, 3/2), the three-body CF2 + 2Br (2PJ) (J = 1/2 3/2), and the molecular elimination channel CF2 + Br2, were observed with quantum yields of 0.84, 0.15, and trace, respectively. The difference between β (CF2Br + Br (2P3/2)) = 0.65 and β (CF2Br + Br (2P1/2)) = 0.80 suggests that the excited A1 and B1 states are strongly correlated by avoided curve crossing with a probability of 0.78. At 265 nm, the radical channel, the observed major primary dissociation channel, shows several components due to the transition close to the curve crossing point. On the basis of observations at both wavelengths, we have proposed a photodissociation dynamics model of CF2Br2 after A-band excitation.
AB - The photodissociation dynamics of CF2Br2 has been studied using a two-dimensional photofragment ion image technique for the two excitation wavelengths 234 and 265 nm. At 234 nm, three dissociation channels, i.e., the radical CF2Br + Br (2PJ) (J = 1/2, 3/2), the three-body CF2 + 2Br (2PJ) (J = 1/2 3/2), and the molecular elimination channel CF2 + Br2, were observed with quantum yields of 0.84, 0.15, and trace, respectively. The difference between β (CF2Br + Br (2P3/2)) = 0.65 and β (CF2Br + Br (2P1/2)) = 0.80 suggests that the excited A1 and B1 states are strongly correlated by avoided curve crossing with a probability of 0.78. At 265 nm, the radical channel, the observed major primary dissociation channel, shows several components due to the transition close to the curve crossing point. On the basis of observations at both wavelengths, we have proposed a photodissociation dynamics model of CF2Br2 after A-band excitation.
UR - http://www.scopus.com/inward/record.url?scp=0035859413&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035859413&partnerID=8YFLogxK
U2 - 10.1021/jp003284i
DO - 10.1021/jp003284i
M3 - Article
AN - SCOPUS:0035859413
VL - 105
SP - 5606
EP - 5612
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 23
ER -