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Uv Photodissociation Dynamics Of Small Molecules And Free Radicals Studied By High N Rydberg H Atom Time Of Flight Spectroscopy
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Book Synopsis UV-photodissociation Dynamics of Small Molecules and Free Radicals Studied by High-n Rydberg H-Atom Time of Flight Spectroscopy by : Gabriel Alejandro Amaral
Download or read book UV-photodissociation Dynamics of Small Molecules and Free Radicals Studied by High-n Rydberg H-Atom Time of Flight Spectroscopy written by Gabriel Alejandro Amaral and published by . This book was released on 2001 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis UV Photodissociation Dynamics of Polyatomic Free Radicals Using High-n Rydberg Atom Time of Flight Spectroscopy by : Michael Scott Lucas
Download or read book UV Photodissociation Dynamics of Polyatomic Free Radicals Using High-n Rydberg Atom Time of Flight Spectroscopy written by Michael Scott Lucas and published by . This book was released on 2016 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 7 will briefly discuss the results of a related system, 3-cyclohexenyl radical, and general conclusions.
Book Synopsis Photodissociation Dynamics of Free Radicals Using High-n Rydberg Atom Time-of-flight Technique by : Yu Song
Download or read book Photodissociation Dynamics of Free Radicals Using High-n Rydberg Atom Time-of-flight Technique written by Yu Song and published by . This book was released on 2011 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first chapter discusses the photodissociation dynamics as well as its experimental methodology. The experimental setup of the HRTOF technique is explained in detail.
Book Synopsis Photodissociation and Reaction Dynamics of Small Molecules and Free Radicals Via High-n Rydberg Hydrogen Atom Time of Flight Spectroscopy by : Kesheng Xu
Download or read book Photodissociation and Reaction Dynamics of Small Molecules and Free Radicals Via High-n Rydberg Hydrogen Atom Time of Flight Spectroscopy written by Kesheng Xu and published by . This book was released on 2001 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photodissociation Spectroscopy and Dynamics of Free Radicals, Clusters, and Ions by : Hyeon Choi
Download or read book Photodissociation Spectroscopy and Dynamics of Free Radicals, Clusters, and Ions written by Hyeon Choi and published by . This book was released on 1999 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals by :
Download or read book Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals written by and published by . This book was released on 2000 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photofragmentation pathways of chemically reactive free radicals have been examined using the technique of fast beam photofragment translational spectroscopy. Measurements of the photodissociation cross-sections, product branching ratios, product state energy distributions, and angular distributions provide insight into the excited state potential energy surfaces and nonadiabatic processes involved in the dissociation mechanisms. Photodissociation spectroscopy and dynamics of the predissociative {tilde A}2A1 and {tilde B}2A2 states of CH3S have been investigated. At all photon energies, CH3 + S(3P{sub j}), was the main reaction channel. The translational energy distributions reveal resolved structure corresponding to vibrational excitation of the CH3 umbrella mode and the S(3P{sub j}) fine-structure distribution from which the nature of the coupled repulsive surfaces is inferred. Dissociation rates are deduced from the photofragment angular distributions, which depend intimately on the degree of vibrational excitation in the C-S stretch. Nitrogen combustion radicals, NCN, CNN and HNCN have also been studied. For all three radicals, the elimination of molecular nitrogen is the primary reaction channel. Excitation to linear excited triplet and singlet electronic states of the NCN radical generates resolved vibrational structure of the N2 photofragment. The relatively low fragment rotational excitation suggests dissociation via a symmetric C{sub 2V} transition state. Resolved vibrational structure of the N2 photofragment is also observed in the photodissociation of the HNCN radical. The fragment vibrational and rotational distributions broaden with increased excitation energy. Simple dissociation models suggest that the HNCN radical isomerizes to a cyclic intermediate (c-HCNN) which then dissociates via a tight cyclic transition state. In contrast to the radicals mentioned above, resolved vibrational structure was not observed for the ICNN radical due to extensive fragment rotational excitation, suggesting that intermediate bent states are strongly coupled along the dissociation pathway. The measurements performed in this Thesis have additionally refined the heats of formation and bond dissociation energies of these radicals and have unambiguously confirmed and added to the known electronic spectroscopy.
Book Synopsis Photodissociation of Small Molecules and Photoionization of Free Radicals Using the VUV Velocity-map Imaging Photoion and Photoelectron Method by : Hong Gao
Download or read book Photodissociation of Small Molecules and Photoionization of Free Radicals Using the VUV Velocity-map Imaging Photoion and Photoelectron Method written by Hong Gao and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The tunable vacuum ultraviolet (VUV) laser generated through the two-photon resonance-enhanced four-wave mixing scheme is combined with the newly developed time-slice velocity map imaging photoion method to study the photodissociation of small molecules in the VUV region, and with the velocity map imaging photoelectron method to study the photoionization of free radicals. The photodissociation dynamics of NO in the energy region around 13.5 eV has been investigated. Branching ratios of the three lowest dissociation channels of 12C16O that produce C(3P) + O(3P), C(1D) + O(3P) and C(3P) + O(1D) are measured for the first time in the VUV region from 102,500 cm−1 to 110,500 cm−1, valuable information of the dissociation dynamics for this prototype system has been deduced. We demonstrated an experiment that has two independently tunable VUV lasers and a time-slice velocity map imaging setup, this provides us a global way to perform systematic state-selected photodissociation of small molecules via state-selected detection of the atomic products in the VUV region. The velocity map imaging photoelectron method was successfully used to obtain the photoelectron spectrum of the propargyl radical (C3H3) via a single VUV photoionization process. The propargyl radical is generated by the 193 nm laser photodissociation of the precursor C3H3Cl. This is the first time that the velocity map imaging photoelectron method is used to get the photoelectron spectra of free radicals, indicating that it is a powerful technique for studying the photoionization of free radicals which are always hard to be produced with high enough number densities for spectroscopic studies.
Book Synopsis Photofragment Translational Spectroscopy of Three Body Dissociations and Free Radicals by : Simon William North
Download or read book Photofragment Translational Spectroscopy of Three Body Dissociations and Free Radicals written by Simon William North and published by . This book was released on 1995 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiphoton Spectroscopy of Rydberg States of Small Molecules by :
Download or read book Multiphoton Spectroscopy of Rydberg States of Small Molecules written by and published by . This book was released on 1990 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphoton ionization techniques provide a versatile means for studying highly excited states of atoms and molecules and provide a valuable complement to traditional techniques based on single-photon absorption and ionization studies. In this paper we present the results of new multiphoton ionization studies of molecular nitrogen and molecular oxygen that serve to illustrate the power of these techniques. 30 refs., 3 figs.
Book Synopsis Photodissociation Processes in Molecular Beams by :
Download or read book Photodissociation Processes in Molecular Beams written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda 310 nm), the quantum yield for the production of O(1D) has been estimated in the past to be unity for the process O3 (1A1) + h.nu.)lambda 300 nm) .--. O3(1B2) .--. O2(1.delta./sub g/) + O(1D). However a small production of O2 (3.sigma./sub g/−) + O(3P) has been observed in this study. The O2(1.delta./sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700°K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Excited States and Free Radicals in Biology and Medicine by : R. V. Bensasson
Download or read book Excited States and Free Radicals in Biology and Medicine written by R. V. Bensasson and published by . This book was released on 1993 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excited states and free radicals are involved in the normal physiology of living systems, in pathological processes (including lipid peroxidation, inflammation, Parkinson's disease, cancer, and aging), in the mechanisms of drug action, and in the photochemotherapies such as the PUVA therapy for skin diseases and PDT for cancer. This text introduces the reader to this rapidly expanding field, one that lies at the borderlines of physics, chemistry, biology, pharmacology, and medicine. The authors explore in particular how time-resolved spectroscopic methods have found solutions at the molecular level to biological and medical problems. Topics include the nature of excited states and free radicals and the techniques for their study, activated oxygen species, DNA, proteins, carotenoids and photosynthetic reaction centers, photodermatology and melanogenesis, and aspects of cancer related to radio-, chemo-, and photodynamic therapy. Researchers and graduate students in photochemistry, photobiology, photomedicine, radiation chemistry and biology, and cancer therapies will find this book to be of very significant interest.
Book Synopsis Dissociation Dynamics of Transient Molecules Studied by Photoelectron-Photofragment Coincidence Spectroscopy by : Amelia Wolpert Ray
Download or read book Dissociation Dynamics of Transient Molecules Studied by Photoelectron-Photofragment Coincidence Spectroscopy written by Amelia Wolpert Ray and published by . This book was released on 2016 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the simplest carboxyl free radical the formyloxyl radical, HCO2, serves as a prototype for more complex carboxyl free radicals such as CH3CO2, C6H5CO2 and HC2CO2. It is also an intermediate in the OH + CO [right arrow] H + CO2 reaction, of increasing interest for both atmospheric and combustion chemistry. The predissociation dynamics for the DCO2− + hv [right arrow] D + CO2 + e− reaction were studied by DPD of DCO2−. Photodetachment near threshold (hv = 4.27 eV) accesses all three of the lowest-lying electronic states (2B2, 2A1, and 2A2) of the formyloxyl radical. The photoelectron spectrum indicates vibrational excitation dominated by the O--C--O bending mode in the 2A1. In the PPC spectra for DCO2−, each vibrational state of the nascent neutral is coupled to bending excitation in the resulting CO2 product observed in the eKE-gated state-resolved translational energy distribution. Each CO2 product-state distribution exhibits a substantial level of bending excitation, more than predicted by recent quantum-dynamics calculations on an ab initio potential energy surface. Extending our work on carboxyl free radicals, the dissociation dynamics of the propiolyl radical, HCCCO2, and its related isomer CCCO2H were studied by DPD of their respective anions using PPC spectroscopy. At hv = 4.27 eV, the HCCCO2− anions is found to readily dissociate to HCC + CO2. Similar to the formyloxyl radical, dissociation to HCC + CO2 results in a series of resolved peaks in the translational energy release spectrum corresponding to the O--C--O bending mode in the CO2 fragment. The isomeric CCCO2H were not observed. High level ab initio calculations and Franck-Condon simulations were carried out to reproduce the stable photoelectron spectrum. Extending the recent work on the F + H2O benchmark F initiated hydrogen abstraction reaction, the effects of vibrational excitation of the precursor anion was explored. To carry out this experiment, an IR laser was coupled into the existing PPC spectrometer using a mirror on the existing neutral beam block. Excitation of the internal hydrogen bond F--H--OH of the anion causes a noticeable change in dissociation dynamics, increasing access to the HF + OH products. Finally, the effects of intramolecular vibrational relaxation of the excited anions was explored by looking at how the anions aged during confinement in the electrostatic ion beam trap. Finally, the F + HOCH3 [right arrow] HF + OCH3 reaction was studied; expanding our work on F initiated hydrogen abstraction reactions. The HF product is formed with considerable excitation while the OCH3 product behaves as a spectator to the reaction. Both the metastable reactant channel van der Waals complex and stable product hydrogen bonded complexes were observed, along with a series of long-lived metastable vibrational Feshbach resonances.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Instruction et prieres du pélerinage, des neuvaines, et de la confrérie à l'honneur de la glorieuse Ste. Hélène, mere de l'Empereur Constantin, en l'Abbaye d'Hautvillers, diocese de Reims by : Jacques Seneuze
Download or read book Instruction et prieres du pélerinage, des neuvaines, et de la confrérie à l'honneur de la glorieuse Ste. Hélène, mere de l'Empereur Constantin, en l'Abbaye d'Hautvillers, diocese de Reims written by Jacques Seneuze and published by . This book was released on 1683 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 26TH International Symposium on Free Radicals. Assisi, Italy, 2-7 September 2001. Book of Abstracts by :
Download or read book 26TH International Symposium on Free Radicals. Assisi, Italy, 2-7 September 2001. Book of Abstracts written by and published by . This book was released on 2001 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sessions: (1) Reaction Dynamics: Experiment and Theory. Reactivity of the O(D1) atom: from state-to-state dynamics to multiple pathway chemistry; Quantum dynamics on some atom-hydrogen insertion reactions; UV and near-UV photodissociation dynamics of small hydrocarbon free radicals. (2) Spectroscopy. Some 'radical' new experiments in molecular spectroscopy; Linear triatomic radicals containing transitions metal atoms: a case history of vibronic coupling; Fourier-transform microwave spectroscopy of the acetyl radical. (3) Astrochemistry. Low temperature reactions of free radicals and their role in the chemistry of interstellar clouds; Fast-flow studies of the C+H2S, C2H2 and C2H4 reactions: A comparison between experimental and theoretical determinations of atomic hydrogen production; Detailed SACM modeling of the reactions O + OH right & left arrows O2 + H and O + OD right & left arrows O2 + D at 0
Download or read book Mass Spectrometry Bulletin written by and published by . This book was released on 1996 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
