Dispersed fluorescence

The resonance vector analysis has been used to explore all of the questions raised above on the fate of the polyad numbers in larger molecules, the most thoroughly investigated case so far probably being C2FI2- This molecule has been very extensively probed by absorption as well as stimulated emission pumping and dispersed fluorescence teclmiques [, 53, 70 and 71], the experimental spectra have been analysed in... 

Tunable visible and ultraviolet lasers were available well before tunable infrared and far-infrared lasers. There are many complexes that contain monomers with visible and near-UV spectra. The earliest experiments to give detailed dynamical infonnation on complexes were in fact those of Smalley et al [22], who observed laser-induced fluorescence (LIF) spectra of He-l2 complexes. They excited the complex in the I2 B <—A band, and were able to produce excited-state complexes containing 5-state I2 in a wide range of vibrational states. From line w idths and dispersed fluorescence spectra, they were able to study the rates and pathways of dissociation. Such work was subsequently extended to many other systems, including the rare gas-Cl2 systems, and has given quite detailed infonnation on potential energy surfaces [231. 

Figure Cl.5.9. Vibrationally resolved dispersed fluorescence spectra of two different single molecules of terrylene in polyetliylene. The excitation wavelengtli for each molecule is indicated and tlie spectra are plotted as the difference between excitation and emitted wavenumber. Each molecule s spectmm was recorded on a CCD detector at two different settings of tire spectrograph grating to examine two different regions of tlie emission spectmm. Type 1 and type 2 spectra were tentatively attributed to terrylene molecules in very different local environments, although tlie possibility tliat type 2 spectra arise from a chemical impurity could not be mled out. Furtlier details are given in Tchenio [105-1071.

Tchenio P, Myers A B and Moerner W E 1993 Dispersed fluorescence spectra of single molecules of pentacene in p-terphenyl J. Chem. Phys. 97 2491-3... 

Single vibronic level, or dispersed, fluorescence spectroscopy... 

The case of water is particularly convenient because the required high Ka states may be detected in the solar absorption spectrum. However, it is difficult to observe the necessary high vibrational angular momentum states in molecules, which can only be probed by dispersed fluorescence or stimulated emission techniques. On the other hand, it is now possible to perform converged variational calculations on accurate potential energy surfaces, from which one could hope to verify the quantum monodromy and assess the extent to which it is disturbed by perturbations with other modes. Examples of such computed monodromy are seen for H2O in Fig. 2 and LiCN in Fig. 12. 

In 1999, the Klemperer group published experimental results from a dispersed fluorescence study of the linear and T-shaped Ar l2(X, v = 0) conformers to obtain information about the X- and B-state potentials of the complex and to gain insight into the photodissociation dynamics in the B electronic state [65]. In carrying out their analysis, they assumed that the linear and T-shaped conformers existed in a thermodynamic equilibrium, with the abundance of the linear conformer being three times that of the T-shaped conformer. In an effort to test the validity of the thermodynamic hypothesis Bastida, et al. [66], performed a... 

In addition, there is a large number of studies involving aromatic alcohols such as phenol [166] or naphthol, which have in part been reviewed before [21], These include time-resolved studies [21], proton transfer models [181], and intermolecular vibrations via dispersed fluorescence [182]. Such doubleresonance and more recently even triple-resonance studies [183] provide important frequency- and time-domain insights into the dynamics of aromatic alcohols, which are not yet possible for aliphatic alcohols. 

M. Schmitt, U. Henrichs, H. Muller, and K. Kleinermanns, Intermolecular vibrations of the phenol dimer revealed by spectral hole burning and dispersed fluorescence spectroscopy. J. Chem. Phys. 103, 9918 9928 (1995). 

Dispersed Fluorescence and Stimulated Emission Pumping Spectroscopy Vibrational Assignment of the Feature States, J. Chem. Phys. 95, 6330. 

Yamanouchi, K., Takeuchi, S., and Tsuchiya, S. (1990), Vibrational Level Structure of Highly Excited S02 in the Electronic Ground State. II. Vibrational Assignment by Dispersed Fluorescence and Stimulated Emission Pumping Spectroscopy, J. Chem. Phys. 92, 4044. 

An X-ray tube with a tungsten target and which serves as the source in an X-ray wavelength dispersive fluorescence spectrometer is equipped with a crystal of ethylenediamine tartrate. The plane of reflection in use corresponds to an inter-reticular distance of d — 4.404 A. 

The vibrogram analysis [108] based on the dispersion fluorescence spectrum of acetylene by Solina et al. [125] reveals a recurrence around 50 fs from 0 to 12,000 cm"1, which is similar to the one in the previous analysis. However, an important recurrence appears at 70 fs at higher energies from 4000 to 16,000 cm 1, which is caused either by anharmonic period lengthening or by a transition to a slower regime at higher energies. 

R. Jost Prof. Field has shown three dispersed fluorescence spectra... 

What remains therefore is to find a way of deriving F fj(t) from the observed signal Fm(t). This can be done by recording, in addition to the time-dependent non-dispersed fluorescence, the dispersed signal. The dispersed... 

It is not possible to discuss all the methods available for characterizing foods critically and systematically in a single volume. Methods pertaining to interfaces (food emulsions, foams, and dispersions), fluorescence, ultrasonics, nuclear magnetic resonance, electron spin resonance, Fourier-transform infrared and near infrared spectroscopy, small-angle neutron scattering, dielectrics, microscopy, rheology, sensors, antibodies, flavor and aroma analysis are included. 

Fluorescence-excitation, hole-burning, and dispersed-fluorescence spectra of 2,2 -bithiophene in a supersonic jet were measured (94JPC12893). 

In order to obtain information on the torsional potential in the So state, dispersed-fluorescence spectra were measured with the excitation of the origin bands of the main and second component, respectively. The UV spectra of some naturally occurring thienyl, bithienyl, and terthienyl derivatives appear in Table 3 (82PP(35)615). Their spectra were related to their... 

An energy dispersive fluorescence Si drift detector associated to a multichannel analyzer will allow to do elemental 2D cartography with spatial resolution at the photon spot scale. 

Proton transfer (process III) in the excited state, which can be followed by the emission of the ionic form of a hydrogen-bonded phenolate anion [A- - BH+(B) —process V]. A large shift is then expected in the excitation spectrum and the dispersed fluorescence spectra typical of A. ... 

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