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  • American Institute of Physics (AIP)  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Diode laser probing of the high-frequency vibrational modes of baths of CO2, N2O, and CO excited by relaxation of highly excited NO2 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5392-5401 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Quenching of highly excited vibrational states of NO2 in baths of CO2, N2O, and CO has been investigated. Dilute NO2 mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. The ν3 antisymmetric stretching modes of CO2 (2349 cm−1) and N2O (2223 cm−1) and the v=1 level of CO (2143 cm−1) were probed with continuous wave IR diode lasers. The amount of energy transferred from excited NO2 to the ν3 modes of both CO2 and N2O was found to be 3%±1% of the original excitation energy. On the other hand, a smaller amount of energy (0.9%±0.3%) was deposited into the CO vibrational mode for NO2 contained in a dilute CO bath. These results support a picture of very inefficient transfer from high energy states of donor molecules to the high-frequency vibrational modes of small bath molecules. Differences in the efficiency of energy reception by the high-frequency modes of these three molecules scale roughly as the infrared transition moments for the bath states indicating the importance of resonance effects in the energy transfer process, but a combination of short- and long-range force mechanisms is probably necessary to account for the observed differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457588
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  • 2
    Electronic Resource
    Electronic Resource
    A nomenclature for Λ-doublet levels in rotating linear molecules (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1749-1753 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: It is proposed that the two Λ-doublet levels of linear molecules with nonzero electronic orbital angular momentum be labeled Λ(A') and Λ(A‘), e.g., Π(A') and Π(A‘) for Π states, etc., according to the following prescription: All series of levels in which the electronic wave function at high J is symmetric with reflection of the spatial coordinates of the electrons in the plane of rotation will be designated Λ(A') for all values of J, and all those for which the electronic wave function is antisymmetric with respect to reflection will be denoted Λ(A‘). It is emphasized that this notation is meant to supplement, and not replace, the accepted spectroscopic e/f labeling and the parity quantum number. The utility of the Λ(A')/Λ(A‘) notation is that it is of most relevance in the mechanistic interpretation of reactive or photodissociative processes involving open-shell molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455121
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  • 3
    Electronic Resource
    Electronic Resource
    Rotationally resolved hot atom collisional excitation of CO2 0001 and 0002 stretching vibrations by time-resolved diode laser spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6240-6254 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A tunable infrared diode laser has been used to monitor the time-resolved absorption of rovibrationally excited CO2 molecules produced in collisions with fast hydrogen atoms from the 193 nm excimer laser photolysis of H2S. Nascent relative rotational population distributions were measured for the 0001 and 0002 vibrational states in CO2 following collisional excitation. The nascent distributions for both of these states were found to be significantly displaced from the 300 K Boltzmann distribution with peaks at J=31 and J=34 for 0001 and 0002, respectively. An approximate diffusion treatment for the mass transport of fast moving hydrogen atoms out of the region of the diode laser probe beam was developed and used to obtain approximate absolute scattering cross sections. Sufficient energy is available in the H/CO2 collision process to excite 0001 rotational states with J greater than 140. The fall-off in excitation probability for J〉31 is ascribed to the small impact parameter necessary to produce vibrationally excited CO2 (0001). This in turn limits the total angular momentum available in those collisions which actually produce 0001. These results are compared with previous experiments measuring the total probability for collisional excitation of all ν3 quanta as well as with various models for inelastic collisional scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454463
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrational excitation of CH3F by collisions with "hot'' H and D atoms (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 145-148 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Hot hydrogen atoms have been produced by photolysis of HBr, HI, and H2S at 193 nm, and HI at 248 nm; D atoms were produced by photolysis of D2S at 193 nm. Vibrational excitation of CH3F in collisions with these hot atoms has been observed by detection of infrared emission at 3.3 μm (ν1, ν4) and 9.6 μm (ν3). Relative probabilities for excitation of these modes have been determined, and the ν3/ν1, ν4 ratio is much larger than is predicted by simple impulsive models. The "isotope effect,'' i.e., relative excitation by H atoms compared to D atoms, is 1.4 for both vibrational modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449807
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  • 5
    Electronic Resource
    Electronic Resource
    Laser-induced-fluorescence study of the reaction of N2O with hot hydrogen atoms from 248 nm excimer laser photolysis of HIa) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2295-2299 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of hot hydrogen atoms with N2O to form OH and N2 has been studied. The hot hydrogen atoms were generated by the photolysis of HI at 248 nm which produces a bimodal distribution of hydrogen atoms having 43.6 and 22.0 kcal/mol of translational energy. The OH produced was monitored by laser-induced fluorescence in the A˜–X˜ transition [(0,0) band]. The nascent rotational distribution of this hot reaction was found to be characterized by a Boltzman temperature of 4700±300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448324
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  • 6
    Electronic Resource
    Electronic Resource
    Diode laser probe of CO2 vibrational excitation produced by collisions with hot deuterium atoms from the 193 nm excimer laser photolysis D2S (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 50-58 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 193 nm excimer laser photolysis of D2S in D2S/CO2 mixtures produces fast deuterium atoms (ETR∼2.2 eV) which vibrationally excite CO2 molecules via inelastic translation–vibration/rotation (T–V/R) energy exchange processes. A high resolution (10−3 cm−1) cw diode laser probe was used to monitor the excitation of ν3 (antisymmetric stretch) and ν2 (bend) vibrations in CO2. The present results are compared with previous experiments involving hot hydrogen atom excitation of CO2 in H2S/CO2 mixtures as well as with theoretical calculations of the excitation probability. The probability for excitation of a ν3 quantum in CO2 is about 1%–2% per gas kinetic D/CO2 collision. Bending (ν2) quanta are produced about eight times more efficiently than antisymmetric stretching (ν3) quanta. The thermalization rate for cooling hot D atoms below the threshold for production of a ν3 vibrational quantum corresponds to less than 2 D*/D2S collisions or 15 D*/CO2 collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450115
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  • 7
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy studies of vapor deposited films of tetrathiafulvalene with iodine (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1074-1076 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Scanning tunneling microscopy studies are reported for vacuum deposited conducting films of tetrathiafulvalene (TTF) with iodine (I) codeposited on mica substrates. Molecular resolution images reveal a crystal structure consistent with that of single crystals of a material with chemical composition (TTF)7I5 with the crystal c axis parallel to the plane of the mica substrate. The imaged surface is terminated with TTF molecules, and the submicron dimension crystal planes which are observed reveal surface steps consistent with the layered and stacked nature characteristic of charge transfer salt materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108799
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