Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Picosecond fluorescence depletion spectroscopy. III. Intramolecular vibrational relaxation in the excited electronic state of p-cyclohexylaniline (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1004-1014 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents the results of the picosecond time-resolved study of intramolecular vibrational relaxation (IVR) in the molecule p-cyclohexylaniline. The results represent the second extensive study of a molecule using the technique which we have developed known as time-resolved fluorescence depletion (TRFD). Fluorescence depletion decays and dispersed fluorescence spectra of 19 S1 vibronic features are presented. The decays show a progression of dynamic behavior, including stationary behavior at low densities of states, quantum beating at intermediate densities, and fast decay of the initially prepared state at high state densities. The data allow us to assign IVR lifetimes which range from 250 ps at 820 cm−1 of excess vibrational energy to 2.2 ps at 2362 cm−1. Even at the highest frequencies we observe, the decays do not tend toward a simple exponential, but instead exhibit weak damped quantum beats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458162
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Picosecond fluorescence depletion spectroscopy. II. Intramolecular vibrational relaxation in the excited electronic state of fluorene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2874-2891 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents the results of the time-resolved study of intramolecular vibrational relaxation in the molecule fluorene. The results represent the first extensive study of a molecule using the technique which we have developed known as the time-resolved fluorescence depletion technique. Fluorescence depletion decays and dispersed fluorescence spectra of 19 vibronic features of fluorene are presented. The decays show a progression of dynamic behavior including stationary behavior at low densities of states, quantum beating at intermediate densities, and fast decay of the initially prepared state at high state densities. The data allow us to assign IVR lifetimes to several vibronic levels of fluorene from 27 ps at 1425 cm−1 of excess vibrational energy to ≤10 ps at ∼2000 cm−1. The degree of spectral congestion in the associated dispersed fluorescence spectra is shown to be related to the dynamic behavior of the vibronic features. In addition, the effects of intermolecular rotational coherences on the time-resolved fluorescence depletion decays of fluorene are explored. With these results we are able to confirm the assignments of the excited state rotational constants which we have made using rotational band contour simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455939
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    High resolution infrared laser induced fluorescence study of state mixing in methyl formate (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6550-6552 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The total infrared fluorescence excitation spectrum in the region of the 101→212 rotational transition in the aldehyde C–H stretch fundamental band of methyl formate has been measured with a resolution of ∼0.007 cm−1. Five peaks were observed, indicating that the zeroth order optically active rovibrational state is mixed with nearly isoenergetic optically inactive bath states. This study marks the first use of a single mode optical parametric oscillator (OPO) for a spectroscopic experiment, and it demonstrates a technique with the potential to probe the vibrational makeup of individual molecular eigenstates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455726
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Interaction between overall and internal rotation below, near, and above the summit of a torsional barrier: 1nπ* methylglyoxal (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2338-2346 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effects of rotation–torsion interactions on the rotational structure of torsional vibronic bands in an electronic spectrum are examined, and a computer program to calculate the relevant energies and transition intensities is described. Rotationally resolved type C bands in the 1nπ* spectrum of methylglyoxal are reported and interpreted. Since the torsional conformation of methylglyoxal differs in the two electronic states, a long progression of bands is observed, involving levels well below, near, and above the 190 cm−1 S1 torsional barrier. The rotation–torsion interaction increases rapidly towards the free rotor limit as the barrier is approached. Observed effects include energy shifts and the appearance of transitions forbidden by rigid rotor or torsional vibronic selection rules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463125
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Picosecond stimulated emission pumping: Intramolecular vibrational relaxation in the excited electronic state of p-cyclohexylaniline (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7344-7351 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Intramolecular vibrational energy redistribution (IVR) is studied by picosecond time resolved stimulated emission pumping (TRSEP). This technique is used to obtain decays for 3 of the 19 previously studied vibronic levels in p-cyclohexylaniline. These TRSEP decays allow one to quantitatively measure the ratio of fast to slow fluorescence intensities in order to obtain accurate values for the number of coupled states. This data inspired us to take a closer look at the time decays which eventually led to the understanding of why the medium energy levels exhibit temporal behavior with fast initial decays and small damped quantum beats when large undamped quantum beats are expected. This paper demonstrates that the rotational state interactions are the cause for this interesting behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462437
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Temperature dependence of picosecond time resolved fluorescence depletion measurements (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6350-6356 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents the results of a temperature dependence study of time resolved fluorescence depletion (TRFD) measurements of intramolecular vibrational energy redistribution in the molecule p-cyclohexylaniline. TRFD scans of five vibrational bands of p-cyclohexylaniline were taken at several molecular beam conditions corresponding to rotational temperatures in the range of 8–110 K. The results are attributed to two possible coupling mechanisms and are shown to be consistent with previous work. Although rotational effects are probably dominant, our data also indicate that excitation of low (40 cm−1) vibrations may contribute to enhanced relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458977
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A stimulated emission pumping study of jet-cooled methyl glyoxal (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 7079-7086 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Stimulated emission pumping (SEP) spectroscopy has been used to investigate rovibrational level mixing in the ground singlet state of methyl glyoxal. A low resolution (0.35 cm−1) SEP survey spectrum allows accurate frequency assignments for 15 normal vibrations and seven hindered rotor levels. High resolution (0.05 cm−1) SEP spectra are reported for selected vibrational bands, including the fundamental vibrations of the symmetric carbonyl stretch and symmetric carbonyl bend. A van der Waals interaction between the neighboring carbonyl oxygen and methyl hydrogens is found to influence mixing of the carbonyl vibrations, affirming the results of previous studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458248
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Erratum: Picosecond fluorescence depletion spectroscopy. III. Intramolecular vibrational relaxation in the excited electronic state of p-cyclohexylaniline [J. Chem. Phys. 92, 1004 (1990)] (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6337-6337 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458608
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Picosecond fluorescence depletion spectroscopy to measure rotational constants in the excited electronic state of p-cyclohexylaniline (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 3991-3992 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457811
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Picosecond fluorescence depletion spectroscopy. I. Theory and apparatus (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2865-2873 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper describes the experimental implementation and theory of a new technique for the time resolved study of intramolecular vibrational redistribution: time resolved fluorescence depletion (TRFD). Picosecond time resolution is obtained by using two pulses of identical wavelength and duration to create and then stimulate emission from a vibrational state in S1. Spontaneous emission intensity is measured as a function of delay between pulses. By monitoring the efficiency with which the second pulse stimulates emission, the evolution of the initial optically prepared state can be followed. A description of the apparatus built for these experiments is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456668
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...