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Showing 1 to 20 of 69 for “"Photodissociation"”.
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Photodissociation Dynamics In Titan's Atmosphere
<p>Photodissociation dynamics of molecules relevant to understanding Titan's atmosphere (diacetylene, cyanoacetylene and heptane isomers) are carried out under collisionless condition using the DC slice imaging technique. In diacetylene photodissociation, two-photon processes dominate at 243 nm and …
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Photodissociation Dynamics of Small Molecules
Energy disposal into CN (product) degrees-of-freedom following photolysis of BrCN and NC=CN (cyanogen) upon absorption of a single 193 nm photon was investigated. Supersonic expansion in a molecular beam was utilized to obtain a narrow distribution of initial parent states. Laser induced …
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Revisiting polycyclic aromatic hydrocarbon emission in Photodissociation regions
The mid-infrared (IR) spectrum of almost all objects in the Universe is dominated by a set of strong emission features characteristic of a class of large organic molecules made of carbon and hydrogen known as polycyclic aromatic hydrocarbons (PAHs). These molecules account for ~15% of the cosmic …
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Theoretical Studies on the ultrafast photodissociation of molecules
Ultrafast photodissociation is a fundamental process in nature. In this thesis we present a study of three very different systems which undergo photodissociation on the femtosecond timescale. A major feature of these processes is the often complex topology of the potential energy surfaces due to …
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Studies of the vapor phase photodissociation of azomethane-d(6)
The photodissociation of fully deuterated azomethane into two CD$\sb3$ radicals and N$\sb2$ was studied using transient CARS spectroscopy as a nanosecond resolved probe of the photoproducts. The Raman-active $\nu\sb1$ symmetric C-D stretching band of CD$\sb3$ radicals was observed and the following …
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Multiwavelength Study of Photodissociation Regions and a Near -Infrared Imager
In this thesis, observations of photodissociation regions (PDRs) in the millimeter, far-infrared, and near-infrared wavelength regimes are interpreted in the context of PDR theory. Three modifications to the standard Tielens & Hollenbach PDR model are considered. The first modification adds …
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Photodissociation dynamics of ozone using Raman excitation profiles (REP's)
… in spite of all the research, the UV photodissociation dynamics of ozone has not been completely understood yet. More specifically, the origin of the small structural features overlapping the broad-band feature in the UV absorption spectrum of ozone still remains a mystery. However, …
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The photodissociation of small Aldehydes: a refined understanding of prototypical dynamical systems
… = 3 - 9, J = 0 -12) are collected following the photodissociation of H2CO via the rR0(0), rR0(1), and rR1(1) transitions to the 2143 state. CO(v, J) distributions correlated with individual H2 (v, J) states reveal that the CO(v) rotational distributions from the 'tight'- transition state (TS) and …
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Coulomb Explosion and Intense-Field Photodissociation of Ion-Beam H2+ and D2+
… In this thesis, the Coulomb explosion and photodissociation channel of H2+ and D2+ have been investigated with 790-nm, sub-100-fs laser pulses by employing a high-resolution photofragment imaging technique. Unlike most experiments, where neutral molecules were used as a target, in this work …
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Photodissociation of molecular ions and low-energy collisions of atoms and ions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Theoretical study of electronic absorption spectra and photodissociation dynamics of atmospherically relevant molecules
… monomer in these complexes and also undertake photodissociation dynamics simulations for the H₂O-N₂O complex. Where possible, we compare and validate our theoretical results with experiment, and in the absence of experimental data, we suggest that our results may be of use to the atmospheric …
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Optical Processes in Xenon: Multiphoton Ionization and Ultraviolet Photodissociation of the Dimer Ion
… quickly forms from the atomic ion, and photodissociation on the 1( 1/2)(,u) (--->) 2( 1/2)(,g) band has been observed after sequential UV pumping. Finally, the role of Xe(,2)('+) in the formation of the excimers XeCl and Xe(,2)Cl has been examined.
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Alkali-rare gas photodissociation lasers: applications to laser physics and atom-atom interactions
This dissertation describes several experiments in which alkali--rare gas laser systems are utilized as a simple platform with which to isolate and study atom-atom interactions and fundamental physical processes that are ill-understood or have never been investigated previously. Specifically, the …
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Optical processes in xenon: Multiphoton ionization and ultraviolet photodissociation of the dimer ion
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-09T18:07:47Z No. of bitstreams: 1 1983_mccown.pdf: 2864187 bytes, checksum: 4f71cae5d24766c4f3268969775f4bf4 (MD5)
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Photooxidation Reactions of Small-Chain Methyl Esters, Aerosol Photoelectron Spectroscopy, and the Photodissociation of Ethylenediamine
<p>Research conducted at the University of San Francisco is presented within this masters thesis, including the Cl-initiated photooxidation reactions of methyl propanoate, methyl butanoate, and methyl valerate (pentanoate), the aerosol photoelectron spectroscopy of isoprene and gamma-valerolactone, …
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Importance des moments dipolaires diagonaux et non-diagonaux dans le processus de photodissociation de HCl⁺ par laser intense
… des informations concernant la dynamique de photodissociation, le projet se transforma rapidement en une étude systématique des effets des moments dipolaires diagonaux et non-diagonaux des molécules diatomiques hétéronucléaires. La première partie de ce travail consistait en la dérivation …
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State-resolved slice imaging of photochemical dynamics
… of</p> <p>the products. In the investigations of photodissociation dynamics of acetone at 230 nm,</p> <p>a bimodal distribution for the resulting CO photoproduct is identied. This observation</p> <p>indicated the presence of unimolecular dissociation mechanism analogues to the roaming</p> …
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Fotodestruição do benzeno em ambientes interestelares
… and destruction rate, and those depend on the photodissociation cross section which is function of the photon energy. We had experimentally study photoionization and photodissociation processes of the benzene (C6H6), and the deuterated benzene (C6D6). Benzene is an essential intermediate in the …
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