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Friday, July 17, 2020 | History

2 edition of Single vibronic level fluorescence and relaxation spectra of s-tetrazine vapor found in the catalog.

Single vibronic level fluorescence and relaxation spectra of s-tetrazine vapor

Donald Verwey Brumbaugh

Single vibronic level fluorescence and relaxation spectra of s-tetrazine vapor

by Donald Verwey Brumbaugh

  • 274 Want to read
  • 18 Currently reading

Published .
Written in English

    Subjects:
  • Tetrazine.

  • Edition Notes

    Statementby Donald Verwey Brumbaugh.
    SeriesPh. D. theses (State University of New York at Binghamton) -- no. 454
    The Physical Object
    Paginationxii, 200 leaves :
    Number of Pages200
    ID Numbers
    Open LibraryOL22079109M

    The third strongest cold band in the Å absorption spectrum of s-tetrazine vapor is assigned to 6b02 by analysis of single-vibronic-level (SVL) fluorescence spectra obtained with a tunable cw. Donald H. Levy's research works with 6, citations and reads, including: Editor's Note: ``Phase separations of single-crystal nanowires grown by self-catalytic chemical vapor deposition.

      We present a computational method for simulating vibronic absorption spectra in the ultraviolet–visible (UV–vis) range and apply it to the 7,7,8,8-tetracyanoquinodimethane anion (TCNQ–), which has been used as a ligand in black absorbers. Gaussian broadening of vertical electronic excitation energies of TCNQ– from linear-response time-dependent density functional theory produces only Cited by: 9. The dimer has two stable conformations, planar and T-shaped. Analysis of the emission spectrum of the dimer has allowed us to identify three dynamical processes in addition to resonance fluorescence. Vibrational relaxation occurs when vibrational energy in a Author: Linda Young, Christopher A. Haynam, Donald H. Levy.

    Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic is a form of most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed most striking example of fluorescence occurs when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible. Stephen C. Wallace's 79 research works with 2, citations and reads, including: ChemInform Abstract: Vibrational Predissociation in S1 1-Methylindole van der Waals Clusters.


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Single vibronic level fluorescence and relaxation spectra of s-tetrazine vapor by Donald Verwey Brumbaugh Download PDF EPUB FB2

Bin ghamton, NYUSA Received 8 December The third strongest cold band in the A. absorption spectrum of s-tetrazine vapor is assigned to 6b~ by analysis of single-vibronic-level (SVL) fluorescence spectra obtained with a tunable cw dye by: Single vibronic level fluorescence and relaxation spectra of s-tetrazine-d 0 and d 2 vapors ☆ Author links open overlay panel Donald V.

Brumbaugh 1 K.K. Innes Show moreCited by: Fluorescence spectra have been obtained at °K from C 6 H 6 and from C 6 D 6 vapor at torr in which all emitting molecules are in the zero‐point vibrational level of the 1 B 2u state.

Analysis of the spectra are completed using selection rules appropriate for D 6h symmetry of both the ground (1 A 1g) and excited (1 B 2u) by: This paper reports results on the spectroscopy and dynamics of trans‐stilbene seeded in a supersonic free jet.

The cooling provided by the expansion results in well‐resolved vibronic structure near the origin. Fluorescence excitation spectra reveal two low frequency vibrational modes at 82 and 95 cm −1 above the origin.

By cm −1 above the origin the discrete vibronic structure has Cited by: JOURNAL OF MOLECULAR spECTRosc () New S, Vibronic Level Assignments for s-Tetrazine Vapor: Polarization and Lifetime Measurements DONALD V.

BRUMBAUGH,' CHRISTOPHER A. HAYNAM, AND DONALD H. LEVY James Franck Institute and Department of Chemistry, University of Chicago, Chicago, Illinois New fluorescence excitation and dispersed SVL fluorescence spectra of s-tetrazine vapor Cited by: We report a study of the 1 B 3u ← 1 A g transition in pyrazine based on a combination of gas phase absorption and single vibronic level fluorescence spectra.

Particular attention is paid to relative transition moments, especially where asymmetries exist between the intensities in the absorption and emission spectra. Band intensities and positions provide evidence for Fermi resonances and Cited by: Abstract We report a study of the 1 B 3u ← 1 A g transition in pyrazine based on a combination of gas phase absorption and single vibronic level fluorescence spectra.

Particular attention is paid to relative transition moments, especially where asymmetries exist between the intensities in the absorption and emission spectra. After mode 4, the most prominent vibrational modes in the origin spectrum are 9 which contrasts with the prominence of modes 5, 6 and 10 and relative unimportance of modes 9 and 12 in the absorption spectrum.

As expected, it is found that the same transitions which occur in the origin spectrum are observed in all other spectra. Fluorescence excitation and single vibronic level emission spectroscopy of the A1A"-X1A' system of CHCl. Except for broader bands, hot bands, and a cm−1 shift of the band to higher frequencies, dimethyl-s-tetrazine as a vapor is found to exhibit t Cited by: Abstract We have generated the benzyl radical in a pulsed discharge jet, and measured vibrationally resolved dispersed fluorescence spectra from single vibronic levels (SVL).

The vibrational analysis of four SVL dispersed fluorescence spectra, obtained by the excitation of the 0 0 0,0 + cm -1, 0 + cm -1, and 6a 0 1 bands in the. alternating single–double bonds in an organic molecule usually implies that the and the spin quantum numbers of the two electrons occupying a given energy level are opposite (spin up and spin down).

Thus, if we have N electrons, the lower states 1 Basic Principles of Fluorescence Spectroscopy. 1 1File Size: KB. A supersonic-jet apparatus has been constructed employing a continuous nozzle and large pumping capacity.

A set of concave mirrors in a ‘Welsh’ arrangement is used inside the vacuum chamber for efficient collection of the fluorescence. The fluorescence excitation spectrum of the 0 band of the ÖX system of aniline. The structure of absorption and single vibronic level fluorescence spectra is reproduced in detail and consistently for all the spectra examined.

It is shown that the intensity of modes ν 8 a and ν 5 a is strongly affected by interference effects, and that Dushinsky mode mixing of totally symmetric modes plays a major role in redistributing Cited by: Franck-Condon activity also is independent of phase; in fact, for ν 6 a it is the same as for s-tetrazine in the vapor phase.

Single vibronic level excitations into the6 a 0 1, 1 0 1, and 6 a 0 2 bands show that vibrational relaxation is appreciable for pressures of a Torr and greater. From the thermalized intensity distribution data extrapolated to the high pressure limit of n-C 4 H 10 as a buffer gas, the ratio of the radiative lifetimes for the two single vibronic levels, 4 1 and 4 0, has been obtained as ±, which agrees well with the theoretical values calculated by either Barnhart and Strickler or Miller and Lee.

Single vibronic level fluorescence spectra of sulfur dioxide have been recorded throughout most of the region corresponding to the Ö X˜ absorption. These spectra show progressions in the symmetric stretching mode of at least five members.

Gas phase fluorescence spectra of 15 vibronic levels in 1 B 2 aniline are described. The emission spectra of single vibronic levels in aniline have well separated vibrational structure. A continuum background seen in a few cases is shown to be due to sequence congestion in the absorption spectrum, not to intramolecular vibrational energy by: 1C-REMPI spectrum contains vibronic features of both rotamers.

When one fix frequency of the burn laser at cm-1 and scan the probe laser, he can obtain the vibronic (hole-burning) spectrum of isomer 1 (structure A) of resorcinol. Fixing frequency at cm-1, one can obtain the vibronic spectrum of isomer 2 (structure A).File Size: 1MB.

For LIF, the laser system is tuned, and when the energy of the vibronic level is reached, the fluorescence signal is detected as fluorescence excitation spectra (FES).

For molecules excited from the v = 1 level, fluorescence results when the frequency matches the separation between v = 1 and the vibronic level. In this paper we measured the fluorescence quantum yield (Φ F) and the reaction quantum yield (Φ PC) of a photochromic molecule (flindersine) as a function of the vibronic level (n) excited within a given found that Φ F decreased and Φ PC increased with an increase in the quantum number of the vibronic level excited within a sequence.

On the basis of a previously proposed model.Raman and infrared spectra of 3-aminobenzotrifluoride, in the liquid phase, and single vibronic level fluorescence spectra, in a supersonic jet, have been obtained and interpreted to give a fairly.Tunneling spectroscopy is an important tool for the chemical identification of single molecules on surfaces.

Here, we show that oligothiophene-based large organic molecules which only differ by single bond orientations can be distinguished by their vibronic fingerprint. These molecules were deposited on a monolayer of the transition metal dichalcogenide molybdenum disulfide (MoS2) on top of a Cited by: 2.