Showing papers in "Chemical Physics in 1988"

TL;DR: In this article, the authors made systematic studies on the charge recombination processes of geminate ion pairs by directly observing their dynamics with ultrafast laser spectroscopy, and they obtained not only the results for the inverted region, but also the results of the top region as well as normal region, confirming the bell-shaped energy gap dependence of the recombination.

TL;DR: In this article, the trans-cis photoisomerism of polymethine dyes has been interpreted from an intramolecular point of view using different and rather inconsistent models of the potential energy surfaces.

TL;DR: In this paper, a Fourier transform mass spectrometer was used to detect high-mass carbon cluster ions (m/e > 800 amu) formed by laser ablation of polyimide and graphite.

TL;DR: In this paper, the A-band photodissociation of CH 3 I has been investigated around 280 nm, to the red of the absorption maximum, and the reduction in β for the latter is discussed in terms of the surface crossing in this channel.

TL;DR: The viscosity of the following binary mixtures was measured near their consolute points: (1) methanol + cyclohexane, (2) isobutyric acid + water, (3) nitroethane + 3-methylpentane, and (4) 2-butoxyethanol + water.

TL;DR: In this paper, the bonding and electronic structure of actinocenes M(COT)2, M = Th, Pa, U, Np and Pu have been studied using the relativistic HFS LCAO method.

TL;DR: In this paper, the carrier generation in benzimidazole perylene/tetraphenyldiamine thin film structures was studied using xerographic, pulsed photoconductivity and fluorescence measurements, and the results showed that carrier generation is dominated by an extrinsic mechanism involving exciton dissociation into free carriers at the pigment/transport layer interface.

TL;DR: In this article, a low pressure vapor of cyanogen iodide (ICN) is photolyzed by a beam of circularly polarized radiation at 248 nm from a KrF excimer laser.

TL;DR: In this paper, the inelastic neutron scattering (INS) spectrum from KHCO 3 powder (5 K) has been analyzed by the frequency and intensity normal coordinate refinement program CLIMAX.

TL;DR: In this article, the nonlinear mechanisms for picosecond degenerate four-wave mixing in organic dyes are reviewed and a theoretical description is given and good agreement between theory and experiment is found in most cases.

TL;DR: In this paper, a quasi-ordered superlattice of excitons is created, where the closest neighbor distribution is used as an order criterion to determine the exciton migration length.

TL;DR: In this article, a continuous supersonic molecular beam of internally cold (NH3)n, clusters was crossed by the IR radiation of a pulsed CO2 laser, which allowed the off-axis detection of selected cluster species, undisturbed by ionizer fragmentation artifacts.

TL;DR: In this article, the authors present a detailed theoretical analysis of three nonlinear optical dephasing experiments, the incoherent photon echo, the accumulated grating echo, and the two-pulse photon echo.

TL;DR: In this article, the authors used the Hamilton R factors to assess further refinements of the fit and suggested the existence of an additional charge transfer (CT) band in the tetracene spectrum, located at 2.77 eV.

TL;DR: In this article, the authors clarified a misconception regarding the regime of validity of Heller's localized wavepacket approach to spectroscopy, and showed that the wave function on the excited surface is a Raman wave function.

TL;DR: In this paper, it was shown that even non-collinear scattering paths can give rise to well-detectable and interpretable signatures in EXAFS spectra, and the authors were able to resolve in the R-space individual contributions of specific double and triple scattering paths and also reproduce their relative amplitudes and phases using full ab initio simulations carried out in the general regime of spherical wave propagation of the ejected/scattered photoelectron.

TL;DR: In this article, rates for rotational transfer, vibrational crossover, and electronic quenching were determined for specific rotational levels, N ′, of A 2 Σ +, ν′ = 1, OH radicals in the presence of N 2 and O 2 quench gases.

TL;DR: In this article, the lifetimes of monomeric singlet O 2 are shown to be 24.5 ms for the b 1 Σ g + state of both isotopic species and 79 s for the a 1 Δ g state of 16 O 2.

TL;DR: In this article, the rate constants of vibrational relaxation in the b 1 Σg+ state and for electronic-to-electronic energy exchange between 16O2 and 18O2 isotopes were derived for H2, D2, N2, CO2, and CH4.

TL;DR: In this article, the binding energies and momentum distributions of the four valence orbitals of H 2 S have been measured by high-resolution electron momentum spectroscopy and compared on a quantitative basis with target Hartree-Fock approximation calculations using SCF wavefunctions.

TL;DR: In this paper, a vibronic coupling model is used for the quantitative interpretation of both the 1 1 B u ← 1 1 A g absorption and the 2 1 A u → 1 1 G fluorescence spectra of 1,8-diphenyl-1,3,5,7-octatetraene (DPO) in cyclohexane solution at 298 K in the absence and in the presence of external electric field (electro-optical spectra).

TL;DR: In this paper, the electronic excitation spectra of all inner shells and the valence shell of DMSO have been measured using electron energy loss spectroscopy (S 2s, 2p, O 1s, C 1s) and synchrotron radiation photoabsorption (S 1s).

TL;DR: In this paper, the formation of NH(A 3Π) in the photolysis of NH2 ( X 2B1), internally excited ground state amidogen prepared by the 1 nm photnlysis NH3, has been studied.

TL;DR: In this paper, it was shown that the large intermolecular polarization forces that arise in the heteronuclear case are precisely matched by anomalously large dispersion forces in the homonuclear cases that come from a giant g ↔ u electronic transition.

TL;DR: In this paper, a series of polyenes, polyynes and cumulenes with centrosymmetric π-chromophores in cyclohexane solution at 298 K were measured and the long-axis component of the polarizability tensor is considerably larger in the first dipole-allowed singlet state compared to the ground state.

TL;DR: Refractometric, dielectric and electro-optical absorption measurements are reported for 1-dimethylamino-2,6-dicyano-4-methyl-benzene (I) and 1,4-bis(4′-dimethyl-benzinyl)bicyclo[2.2]octane (II) as discussed by the authors.

TL;DR: In this article, the fluorescence lifetimes of NO molecules have been investigated under collision-free conditions in a free jet expansion, and a new dependence of the electronic transition moment on internuclear distance has been derived for the A2Σ+-X2Π transition to account for the variation of the radiative lifetimes.

TL;DR: In this paper, a new improved spherically averaged potential surface for NeCH 4 was determined with a potential well depth of ϵ = 5.50 meV and a minimum distance of R m = 3.78 A.

TL;DR: In this paper, a method that allows the separate calculation of intermolecular harmonic vibrational frequencies of molecular clusters on the basis of either ab initio calculations or intermolescular potential functions is presented.

TL;DR: In this article, the authors used the QCFF/PI method and the CNDO/S+CISD method in the floating atomic orbital basis set to study Franck-Condon and vibronic activity of the ag and b3g modes of anthracene in the S0 ↔ S1 transition.