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Picosecond vibrational dynamics of several S1 bands in jet-cooled p-difluorobenzene (1994)

Zhang, Xu ; Smith, Jonathan M. ; Knee, J. L.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 100 (1994), S. 2429-2436

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: Picosecond pump–probe threshold photoelectron spectroscopy was used to investigate the vibrational dynamics of four vibrational bands in the S1 state of p-difluorobenzene in the range 2000 to 2900 cm−1. In this energy region the vibrations exhibited intermediate case restricted vibrational dynamics as evidenced by observed quantum beats as well as irreversible statistical limit decay. More complete coverage of the S1 state was prohibited by the wavelength restrictions on both the pump and probe laser wavelengths required in the experiment. The observed restricted vibrational redistribution is in contrast to the very rapid irreversible decays inferred from room temperature, high pressure chemical timing experiments on the same molecular bands. The differences are discussed in terms of the role of molecular rotations and the possible different experimental observations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.466491

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A functional role for nitric oxide in locus coeruleus: immunohistochemical and electrophysiological studies (1994)

Xu, Zhi-Qing ; Pieribone, Vincent A. ; Zhang, Xu ; [et al.]

Springer

Experimental brain research 98 (1994), S. 75-83

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ISSN: 1432-1106

Keywords: Synaptic transmission ; Brain slice ; Synapse ; Nitric oxide synthase ; Rat

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Immunohistochemical analysis of the localization of nitric oxide synthase-(NOS)-like immunoreactivity revealed the presence of this enzyme in a few neuronal cell bodies and in dendritic and axonal processes within the rat locus coeruleus (LC). Also cells in the pericoeruleus area were NOS-positive. Intracellular recordings were made from LC neurons in brain slices. Bath application of the NOS inhibitors nitro-l-arginine methyl ester (l-NAME) or N G-monomethyl-l-arginine (l-NMMA) potently enhanced the excitatory postsynaptic potential (EPSP) evoked by focal electrical stimulation of the slice. Hemoglobin, which binds extracellular NO, also enhanced the EPSP. This enhancement was reversed by coadministration of l-arginine, a precursor of neuronal nitric oxide (NO). Neither NOS inhibitors, l-arginine, nor hemoglobin had effects on the resting membrane potential or impedance. These results suggest a role for NO in synaptic transmission in the LC.