Fast beam studies of free radical photodissociation

Thesis/Dissertation · Mon Nov 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10148491· OSTI ID:10148491

Cyr, Douglas Robert ^[1]

---

1. Univ. of California, Berkeley, CA (United States)

The photodissociation of free radicals is studied in order to characterize the spectroscopy and dissociation dynamics of the dissociative electronic states in these species. To accomplish this, a novel method of radical production, based on the photodetachment of the corresponding negative ion, has been combined with a highly complementary form of photofragment translational spectroscopy. The optical spectroscopy of transitions to dissociative states is determined by monitoring the total photofragment yield as a function of dissociation photon energy. Branching ratios to various product channels, internal energy distributions of the fragments, bond dissociation energies, and the translational energy-dependent photofragment recoil angular distributions are then determined at selected excitation energies. A detailed picture of the dissociation dynamics can then be formulated, allowing insight concerning the interactions of potential energy surfaces involved in the dissociation. After an introduction to the concepts and techniques mentioned above, the experimental apparatus used in these experiments is described in detail. The basis and methods used in the treatment of data, especially in the dissociation dynamics experiments, are then put forward.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10148491
• Report Number(s): LBL--34924; ON: DE94011380; CNN: Grant CHE 91-08145
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500
664400
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CROSS SECTIONS
DISSOCIATION
EXCITED STATES
EXPERIMENTALLY DERIVED INFORMATION ON ATOMIC AND MOLECULAR PROPERTIES
NITROGEN
OXYGEN
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
RADICALS