165 research outputs found
Mixing of the vibrational angular momentum components of multiply degenerate vibronic states of benzene by vibrational l-type resonance
The rotationally resolved spectra of the 6011002 and 6011602 vibronic transitions of benzene at low rotational temperat reported and analyzed in detail. Deperturbed spectroscopic constants for the 61102 and 61162 states are reported which reproduce the observed line positions to within experimental accuracy. The splitting of 17.9 cmâ1 between the two subbands of the 6011002 transition and of 6.2 cmâ1 for the 6011602 transition is found to be due to vibrational l-type resonances with matrix element 8.91 and 2.65 cmâ1, respectively. These large resonances cause strong distortions of the rotational structure and mix the vibrational angular momentum substates ν6minus-or-plus sign + 2ν100 and ν6Âą + 2ν10Âą2 nearly completely and the substates ν6minus-or-plus sign + 2ν160 and ν6Âą + 2ν16minus-or-plus sign2 substantially. The importance of the mixing for the intramolecular vibrational redistribution (IVR) and the decay behaviour of S1 benzene is discussed
High-resolution UV spectrum of the benzeneâN2 van der Waals complex
The rotationally resolved spectrum of the 610 band of the S1 â S0 electronic transition of the benzeneâN2 van der Waals complex has been recorded and 119 transitions assigned. The C6H6¡N2 complex, produced in a pulsed molecular beam, was detected by mass-selected two-photon two-colour ionization employing a high-resolution (ÎνUV = 100 MHz, fwhm) pulsed-amplified cw laser for the resonant intermediate excitation. The observed rotational structure is that of a rigid symmetric top with weaker additional rotational transitions most likely arising from the free internal rotation of the N2 in the plane parallel to the benzene ring. The N2 is located parallel to the benzene ring at a distance of 3.50 Ă
; this decreases by 45 mĂ
in the excited electronic state
Pulsed Doppler-free two-photon spectroscopy of polyatomic molecules
Doppler-free two-photon electronic spectra of a large polyatomic molecule are recorded for the first time with pulsed laser radiation of near Fourier-transform limited bandwidth (Îvnot, vert, similar100 MHz). The resolution obtained is sufficient to resolve individual rotational lines. Due to the high density of these rotational transitions a strong Doppler-broadened background is observed, which is, however, subtantially reduced by suitable choice of photon polarizations. Different vibronic bands of benzene (C6H6) are investigated and very accurate rotational constants are found
On the solutions of the Schrodinger equation with some molecular potentials: wave function ansatz
Making an ansatz to the wave function, the exact solutions of the %
-dimensional radial Schrodinger equation with some molecular potentials like
pseudoharmonic and modified Kratzer potentials are obtained. The restriction on
the parameters of the given potential, and are also given,
where depends on a linear combination of the angular momentum quantum
number and the spatial dimensions and is a parameter in
the ansatz to the wave function. On inserting D=3, we find that the bound state
eigensolutions recover their standard analytical forms in literature.Comment: 14 page
Rotationally resolved fluorescence-dip and ion-dip spectra of single rovibronic states of benzene
Adaptive optical interconnects: The ADDAPT project
Existing optical networks are driven by dynamic user and application demands but operate statically at their maximum performance. Thus, optical links do not offer much adaptability and are not very energy-effcient. In this paper a novel approach of implementing performance and power adaptivity from system down to optical device, electrical circuit and transistor level is proposed. Depending on the actual data load, the number of activated link paths and individual device parameters like bandwidth, clock rate, modulation format and gain are adapted to enable lowering the components supply power. This enables exible energy-efficient optical transmission links which pave the way for massive reductions of CO2 emission and operating costs in data center and high performance computing applications. Within the FP7 research project Adaptive Data and Power Aware Transceivers for Optical Communications (ADDAPT) dynamic high-speed energy-efficent transceiver subsystems are developed for short-range optical interconnects taking up new adaptive technologies and methods. The research of eight partners from industry, research and education spanning seven European countries includes the investigation of several adaptive control types and algorithms, the development of a full transceiver system, the design and fabrication of optical components and integrated circuits as well as the development of high-speed, low-loss packaging solutions. This paper describes and discusses the idea of ADDAPT and provides an overview about the latest research results in this field
ChemInform Abstract: THE PERPENDICULAR CARBON-DEUTERIUM STRETCHING BAND ν8 OF ALLENE-D4
ChemInform Abstract: High-Resolution Study of the C-D Stretching Bands of 12C6D6 and 13C6D6.
ChemInform Abstract: High-Resolution Fourier Transform Study of the ν14 Band of Benzene-d6
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