ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
Filter
  • American Institute of Physics (AIP)  (7)
  • 1995-1999
  • 1990-1994  (7)
  • 1985-1989
  • 1
    Electronic Resource
    Electronic Resource
    Doppler profiles and fine-structure branching ratios of O(3Pj) from photodissociation of carbon dioxide at 157 nm (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7311-7316 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The O(2p 3Pj) (j=2, 1, and 0) fragments produced in the 157 nm photodissociation of CO2 were detected by resonance-enhanced multiphoton ionization in a molecular beam. The Doppler profiles and fine-structure branching ratios were measured for the oxygen-atom photofragment in the 3Pj states. The Doppler profiles were analyzed to give an anisotropy parameter of β=2.0±0.2 and an internal energy equivalent to 3.9±0.3 vibrational quanta of CO. The fine-structure populations were found to be 0.70±0.05, 0.16±0.03, and 0.14±0.03 (with error bars of ±σ) for j=2, 1, and 0, respectively. A mechanism is proposed in which complex on the 1B2 surface undergoes intersystem crossing to the 3B2 surface. A phase-space model with a constraint on the impact parameter is shown to be consistent with the observed energy release. The nonstatistical fine-structure population could be caused by long-range interactions on the triplet surface. In a bulb experiment, O(3P) was produced by quenching of O(1D). The fine-structure populations of the resulting O(3Pj) were 0.64±0.04, 0.25±0.04, and 0.11±0.04. This state distribution is consistent with a long-lived complex which decays to give statistical products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461408
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The effect of amplified spontaneous emission on the measurement of the multiplet state distribution of ground state oxygen atoms (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 6363-6368 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Amplified spontaneous emission (ASE) is a process which competes with laser-induced fluorescence (LIF) in three level systems. This was demonstrated in the case of oxygen atoms, for which both ASE and LIF were observed at 845 nm. Ground state oxygen atoms were generated by photodissociating O2, SO2, and NO2 in a pump and probe experiment. Both nascent and thermalized O(3Pj‘) atoms were measured using two-photon LIF at 226 nm. The fine structure populations deduced from the 845 nm (3p3Pj'→3s3S) emission were considerably hotter than the distributions obtained from the 130 nm (3s3S→2p3P) transition. A kinetic model is developed showing that the distributions observed at 845 are distorted by ASE, which selectively depletes the populations of atoms originating from more highly populated multiplet levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463697
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Determination of the internal state distribution of NO(X 2Π) produced in the O(3P)+NH(X 3Σ−) reaction (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 180-188 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The internal state distribution of the NO product from the O(3P)+NH(X 3Σ−) reaction has been determined from a laser fluorescence experiment in a cell at a total pressure of 60 mTorr. The O atom and the NH reagents were prepared in a microwave discharge in oxygen and by the two-photon 193 nm photolysis of ammonia, respectively. The NO product was observed in the vibrational levels v=1–8 by laser fluorescence excitation in A 2Σ+–X 2Π bands. The nascent vibrational state distribution was found to be monotonically decreasing vs increasing v. The v=1 rotational state distribution, extrapolated back to zero photolysis-probe delay, could be parametrized as a 1130±50 K Boltzmann distribution. Very little of the available energy is found as internal excitation of the NO product. The O+NH→H+NO reaction is expected to proceed by the formation and decay of a short-lived HNO complex. The observed NO vibrational state distribution is interpreted in terms of a Franck–Condon model involving the overlap of vibrational wave functions for the NO stretch coordinate in the HNO complex with those for vibration in the free NO product. The NO rotational state distribution is governed largely by kinematic constraints in this H+HL→HH+L reaction, where H and L are heavy and light atoms, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463606
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The multiplet state distribution of O(3PJ) produced in the 193 nm photodissociation of SO2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 868-869 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The multiplet state distribution of oxygen atoms produced in the photodissociation of SO2 was measured in a pump-and-probe experiment. An ArF laser was used to dissociate the parent molecule, while the O(3P) product was detected by two-photon laser-induced fluorescence under collisionless conditions. The multiplet populations were found to be 59.2%±5.0%, 29.5%±3.2%, and 11.4%±3.3% for J=2, 1, and 0, respectively. These results are indistinguishable from the statistical distribution of 5:3:1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459462
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The multiplet state distribution of O(3PJ) produced in the photodissociation of O2 at 157 nm (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2640-2647 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fine structure population of O(3P) produced in the photodissociation of O2 at 157 nm was measured in a pump-and-probe experiment. The population of the ground state (J=2) was found to be 93%, with only 6% in the J=1 level and 1% in J=0. The predominance of J=2 is consistent with direct dissociation on the B 3Σ−u potential energy surface. Based on available information in the literature we rule out excitation of the 3Πu state and curve crossing to the 5Πu state as possible origins of the population with J〈2. We infer that the populations of J〈2 is due to nonadiabatic transitions at large distances. Two mechanisms consistent with the data are a Demkov-type interaction, which is caused by coupling by the radial kinetic energy operator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460709
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The production of vibrationally excited hydrogen molecules (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 604-610 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The partial pressure of vibrationally excited hydrogen has been measured in a flowing gas using the technique of vacuum ultraviolet laser-induced fluorescence. In most of the studies H2 (v=1) was generated with a microwave discharge. For this source we measured in detail the effects of the partial pressures of H2 and Ar, the flow rate, the microwave power, and the construction of the flow tube. A more limited study was also performed using a thermally heated flow tube.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345761
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Experimental and theoretical characterization of the BAr van der Waals complex: The X 2Π, A 2Σ+, and B 2Σ+ electronic states (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 8484-8495 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The BAr van der Waals complex and its electronic transition correlating with the B atom 3s 2S–2p 2P transition have been characterized in a combined experimental and theoretical investigation. The experimental portion of the study consisted of the observation by laser fluorescence excitation of rotationally resolved bands of this molecule in a supersonic jet. Specifically, four bands of the (v',0) progression of the B 2Σ+–X 2Π1/2 band system of each of the 11,10BAr isotopomers were observed and analyzed, where the upper state vibrational quantum numbers v'=4–7 were determined from the isotope splittings. Vibrational and rotational constants were obtained through fits to the observed transition wave numbers. These experimental results were compared with ab initio calculations of the X 2Π, A 2Σ+, and B 2Σ+ electronic states of BAr. In order to obtain the interaction energies of the excited states of this weakly bound system accurately, multireference, internally contracted, configuration-interaction calculations were carried out, with additional provision for the effect of higher order excitations. The information derived about these states from the experiment and calculations agree reasonably well. An interesting feature of the BAr B 2Σ+ state is the presence of a barrier in the potential energy curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464507
    Location Call Number Expected 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...