Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2
A novel experiment for near-threshold photodissociation studies is presented. State-selective excitation of the molecular photofragments to high-n Rydberg states is used in a variation of the ion imaging technique, allowing for undistorted detection of slow fragments produced close to the channel di...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2000
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| _version_ | 1826297304289640448 |
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| author | Monti, O Dickinson, H Mackenzie, S Softley, T |
| author_facet | Monti, O Dickinson, H Mackenzie, S Softley, T |
| author_sort | Monti, O |
| collection | OXFORD |
| description | A novel experiment for near-threshold photodissociation studies is presented. State-selective excitation of the molecular photofragments to high-n Rydberg states is used in a variation of the ion imaging technique, allowing for undistorted detection of slow fragments produced close to the channel dissociation threshold. As a first demonstration of this method, the angular anisotropy parameter β for production of NO (J = 17/2) and O3P2 in the photodissociation of NO2 has been obtained as a function of excess energy. A classical model for β as a function of excess energy is presented, accounting for the decrease of anisotropy in the angular photofragment distribution upon approaching the channel threshold. The experimental values of β fluctuate substantially around the values predicted by the model, indicating strong underlying fluctuations in the state-to-state rate constant. This experiment offers in principle a unique route to measuring state-to-state reaction rate constants in situations where existing time- or frequency-resolved methods are inappropriate. © 2000 American Institute of Physics. |
| first_indexed | 2024-03-07T04:29:32Z |
| format | Journal article |
| id | oxford-uuid:cdd7e9f5-798e-49ce-ad25-b8a32080c6b4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:29:32Z |
| publishDate | 2000 |
| record_format | dspace |
| spelling | oxford-uuid:cdd7e9f5-798e-49ce-ad25-b8a32080c6b42022-03-27T07:31:33ZRapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cdd7e9f5-798e-49ce-ad25-b8a32080c6b4EnglishSymplectic Elements at Oxford2000Monti, ODickinson, HMackenzie, SSoftley, TA novel experiment for near-threshold photodissociation studies is presented. State-selective excitation of the molecular photofragments to high-n Rydberg states is used in a variation of the ion imaging technique, allowing for undistorted detection of slow fragments produced close to the channel dissociation threshold. As a first demonstration of this method, the angular anisotropy parameter β for production of NO (J = 17/2) and O3P2 in the photodissociation of NO2 has been obtained as a function of excess energy. A classical model for β as a function of excess energy is presented, accounting for the decrease of anisotropy in the angular photofragment distribution upon approaching the channel threshold. The experimental values of β fluctuate substantially around the values predicted by the model, indicating strong underlying fluctuations in the state-to-state rate constant. This experiment offers in principle a unique route to measuring state-to-state reaction rate constants in situations where existing time- or frequency-resolved methods are inappropriate. © 2000 American Institute of Physics. |
| spellingShingle | Monti, O Dickinson, H Mackenzie, S Softley, T Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title | Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title_full | Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title_fullStr | Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title_full_unstemmed | Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title_short | Rapidly fluctuating anisotropy parameter in the near-threshold photodissociation of NO2 |
| title_sort | rapidly fluctuating anisotropy parameter in the near threshold photodissociation of no2 |
| work_keys_str_mv | AT montio rapidlyfluctuatinganisotropyparameterinthenearthresholdphotodissociationofno2 AT dickinsonh rapidlyfluctuatinganisotropyparameterinthenearthresholdphotodissociationofno2 AT mackenzies rapidlyfluctuatinganisotropyparameterinthenearthresholdphotodissociationofno2 AT softleyt rapidlyfluctuatinganisotropyparameterinthenearthresholdphotodissociationofno2 |