| Autor: |
C. R. Dickson, Richard N. Zare, J.B. Kinney |
| Rok vydání: |
1976 |
| Předmět: |
|
| Zdroj: |
Chemical Physics. 15:243-248 |
| ISSN: |
0301-0104 |
| DOI: |
10.1016/0301-0104(76)80157-7 |
| Popis: |
A study is made of the visible chemiluminescence resulting from the reaction of an atomic beam of barium with IZ under single-collision conditions (∼ 10−4 torr). The resulting spectrum consists of the BaI C2Π → X2Σ emission on top of an underlying “continuum”. The variation of the BaI emission intensity with Ba and I2 flux is investigated, and it is concluded that the reaction is bimolecular. The total phenomenological cross section for barium atom removal is determined to be 86 A2, which agrees well with the total reactive cross section calculated assuming an electron jump mechanism. The short wavelength cutoff is identified as the transition from the υ′ = 41 level of the BaI C2Π 3 2 state to the υ′ = 41 level of the BaI X2Σ state. A strict lower bound Do0(BaI) ⩾ 102 ± 0.7 kcal/mole for the ground state dissociation energy of BaI is obtained from this short wavelength cutoff. The value Do0(BaI) = 102 ± 1 kcal/mole is recommended, where the error estimate includes the possible contribution from the final relative translational energy of the products. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
