Back to Search
Start Over
Rotational state specific dissociation dynamics of D 2 O via the C̃(010) state: The effect of bending vibrational excitation.
- Source :
-
The Journal of chemical physics [J Chem Phys] 2022 Jun 07; Vol. 156 (21), pp. 214301. - Publication Year :
- 2022
-
Abstract
- The rotational state resolved photodissociation dynamics of D <subscript>2</subscript> O via the C̃(010) state has been investigated by using the D-atom Rydberg tagging time-of-flight technique combined with a tunable vacuum ultraviolet light source. The D-atom action spectrum of the C̃(010) ← X̃(000) band and the corresponding time-of-flight (TOF) spectra of D-atom photoproducts formed following the excitation of D <subscript>2</subscript> O to individual rotational transition have been measured. By comparison with the action spectrum of the C̃(000) ← X̃(000) band, the bending vibrational constant of the C̃ state for D <subscript>2</subscript> O can be determined to be v <subscript>2</subscript> = 1041.37 ± 0.71 cm <superscript>-1</superscript> . From the TOF spectra, the product kinetic energy spectra, the vibrational state distributions of OD products, and the state resolved anisotropy parameters have been determined. The experimental results indicate a dramatic variation in the OD product state distributions for different rotational excitations. This illuminates that there are two distinctive coupling channels from the C̃(010) state to the low-lying electronic states: the homogeneous electronic coupling to the à <superscript>1</superscript> B <subscript>1</subscript> state, resulting in vibrationally hot OD(X) products, and the Coriolis-type coupling to the B̃ <superscript>1</superscript> A <subscript>1</subscript> state, producing vibrationally cold but rotationally hot OD(X) and OD(A) products. Furthermore, the three-body dissociation channel is confirmed, which is attributed to the C̃ → <superscript>1</superscript> A <subscript>2</subscript> or C̃ → à pathway. In comparison with the previous results of D <subscript>2</subscript> O photolysis via the C̃(000) state, it is found that the v <subscript>2</subscript> vibration of the parent molecule enhances both the vibrational and rotational excitations of OD products.
Details
- Language :
- English
- ISSN :
- 1089-7690
- Volume :
- 156
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- The Journal of chemical physics
- Publication Type :
- Academic Journal
- Accession number :
- 35676157
- Full Text :
- https://doi.org/10.1063/5.0091762