Reaction dynamics and photochemistry of divalent systems

Thesis/Dissertation · Fri May 01 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/10181507· OSTI ID:10181507

Davis, H. Floyd ^[1]

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

Results are presented of molecular beam studies of bimolecular and unimolecular reactions of Ba. Chapter 1 discusses the reaction Ba + NO₂. Formation of the dominant BaO(¹Σ) + NO products resulted primarily from decay of long-lived Ba⁺NO₂^- collision complexes. Secondary mechanisms led to formation of forward scattered, internally excited BaO, and BaNO + O. D_o(Ba-NO) = 65±20 kcal/mol. Reactions of ground state and electronically excited Ba with water and alcohols are examined in Chapter 2. Reaction of Ba(¹S) + H²O led to BaO + H₂, whereas excited state Ba(¹D) + H₂O reacted to form BaOH + H. Collisions between Ba and CH₃OH led to BaOCH₃ + H. Radical channels involve H-atom migration and are promoted by excitation of the incident Ba atom. In Chapter 3, reactions of Ba(¹S) with ClO₂2 and O₃ are discussed. Again, direct and complex mechanisms were observed. Formation of BaCl + O₂ from decomposition of Ba⁺ClO₂^- accounted for 10% of total reaction crass section. Although Ba + O₃ → BaO + 0₂ occurs primarily by direct reaction mechanisms, the secondary channel Ba + 0₃ → BaO₂ + 0 involved decay of long lived Ba¹⁺O₃^- intermediates. D_o(Ba-O₂) = 120 ±20 kcal/mol. Photodissociation dynamics of NO₃ is explored in chapter 4. Visible excitation leads to formation of NO + 0₂ and NO₂ + O. Wavelength dependence of branching ratios is investigated. D_o(O-NO₂) = 48.55 kcal/mole ;and calculate ΔH_f(NO₃) = 17.75 kcal/mole (298K). Chapter 5 discusses the photodissociation of OClO in a molecular beam. Although ClO(²II) + O(³P) is dominant, Cl(²P) + O₂ also forms, with a max yield of 3.9±0.8% near 404nm.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDO
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10181507
• Report Number(s): LBL-32515; ON: DE92041173
• Resource Relation: Other Information: TH: Thesis (Ph.D.); PBD: May 1992
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM
CHEMICAL REACTIONS
NITROGEN DIOXIDE
CHLORINE OXIDES
PHOTOLYSIS
OZONE
NITROGEN OXIDES
RADICALS
COLLIDING BEAMS
MOLECULAR BEAMS
ATOMIC BEAMS
EXCITED STATES
ATOM-MOLECULE COLLISIONS
ISOTOPE EFFECTS
DEUTERIUM
CHEMICAL REACTION KINETICS
METHYL ETHER
664300
400500
400201
COLLISION PHENOMENA
PHOTOCHEMISTRY
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES