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: 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 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 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, 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 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 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 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, 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 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 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 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 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 article, the authors analyzed the time-resolved detection of excited-state vibrational motion and vibronic coupling with femtosecond pump-probe spectroscopy with respect to the radiation-matter interaction.

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: 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: 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 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 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 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.

TL;DR: In this paper, a complete optimization of the structures and calculations of the harmonic force fields for glyoxal and acrolein stable forms in the ground electronic state have been carried out at the RHF/6-31G level.

TL;DR: An ab initio theoretical study was undertaken on the photochemical process of CH3SH dissociation as mentioned in this paper, where the potential energy surfaces have been calculated for the SH and CH fragmentations according to a coplanar abstraction model.

TL;DR: The rotational, Λ doublet and spin state distributions of the NO fragment following dissociation from NOCl and NOBr have been measured using a one-colour photolysis analysis laser scheme as discussed by the authors.

TL;DR: In this paper, the absorption and fluorescence spectra and lifetime of Cr3+ ions in two garnet hosts, Gd3Ga5O12 and gd3Sc2Ga3O12, were measured as a function of temperature.