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  • 1
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    Microbial community in a sediment-hosted CO2 lake of the southern Okinawa Trough hydrothermal system. (2006)
    In:  EPIC3PNAS, 103(38), pp. 13899-13900
    Details
    Publication Date: 2014-09-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of continuum absorption spectra in far wings of the Yb resonance line broadened by He, Ne, Ar, Kr, Xe, and Yb (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8083-8088 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have determined reduced absorption coefficients in far wings of the Yb (6s2)1S0–(6s6p)1P1 line broadened by He, Ne, Ar, Kr, Xe, and Yb. We find a prominent blue-satellite peak for all perturbers and undulations between the satellite peak and the line center for Ne, Ar, Kr, and Xe. Analyzing the satellite band with the aid of the unified Franck–Condon method, we obtain the position and the height of the extremum on the difference potential-energy curves concerned. We have also observed collision-induced-dipole absorption bands associated with the transition (6s2)1S0–(6s5d)3D2 of atomic Yb for Ne, Ar, Kr, and Xe perturbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461815
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  • 3
    Electronic Resource
    Electronic Resource
    Blue satellite structure of the Ba resonance line broadened by rare gases (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 9492-9493 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463277
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  • 4
    Electronic Resource
    Electronic Resource
    A method for determining the column density from the pressure-broadened resonance lines (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1690-1694 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a method for determining metal-atom number-density integrated over a line-of-sight (i.e., the column density) by measuring the optical depth in the wings of the pressure-broadened resonance lines. This method is capable of monitoring the column density in situ during photoelectric absorption measurement of metal vapors in a synchrotron radiation beamline. The present method requires measuring the reduced absorption coefficients of the metal–metal and metal–buffer-gas collisional quasimolecules γMM and γMG and the effective vapor length l before its use. We thus describe also the procedure for obtaining γMM, γMG, and l using He-buffered Yb vapor as a specific example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143324
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  • 5
    Electronic Resource
    Electronic Resource
    Far-wing excitation study on the transit region of Hg 3P1→3P0 intramultiplet process in collisions with N2 and CO (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 7341-7350 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser-pump and probe approach has been applied to the far wings of Hg 3P1−1S0 resonance line broadened by collisions with N2 and CO to measure excitation spectra for the formation of Hg(6 3P0) and Hg(6 3P1). The excitation spectra are highly asymmetric with the red wing being much more extended than the blue wing. The absolute ratio of nascent yields of Hg 3P0 to 3P1 is determined as a function of the excitation wave number. From these measurements, it is found, commonly for Hg–N2 and Hg–CO systems, that (a) the nascent product ratio, Hg(3P0)/Hg(3P1), grows on the red-wing surface (the A˜ state) with increasing shift, Δν, of the excitation wave number from the line center and finally surpasses unity; (b) the blue-wing surface (the B˜ state) gives mostly Hg(3P1) but has a small chance to give Hg(3P0). Time constant τ0 for the A˜→3P0 process of Hg–N2 is found to change from 17 to 35 ns as the absorption distance Rc between Hg and N2 changes from 3.6 to 4.7 A(ring). From these values of τ0, the transition probability P(A˜→3P0) for a single approach of Hg–N2 to the turning point region is estimated to be about 3.7×10−5. The transition probability P(B˜→3P0) is about 270 times larger than P(A˜→3P0).CO is about 20 times more effective than N2 for the B˜→3P0 process. The Rc dependence of τ0 can be qualitatively explained by the vibrational frequencies of the bound A˜ state and the Franck–Condon factor between the bound A˜ state and the free (repulsive) a˜ state arising from Hg(3P0)+N2. These findings suggest that the direct A˜→a˜ transition is realized in these Hg–N2 and Hg–CO collisions. This gives a remarkable contrast to Hg-atom collisions, where the A→3P0 process is parity-forbidden due to the 0+ and 0− characters of the A and a states, respectively. The coupling mechanisms for the A˜→a˜ and B˜→a˜ transitions in Hg–N2 collisions are discussed in detail. The theoretical estimate of the A˜→a˜ transition probability is made to be compared with the experimental value. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469046
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  • 6
    Electronic Resource
    Electronic Resource
    B KVV and Cl LVV normal and resonance Auger electron spectra in gaseous BCl3 molecules (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 7320-7326 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The B KVV and Cl LVV normal and resonance Auger electron spectra in gaseous BCl3 have been observed with use of tunable photon beam from synchrotron radiation. The spectrum excited by photons with energy above the B K and the Cl L2,3 thresholds shows preferentially Cl LVV normal Auger bands. The pure B KVV normal Auger spectrum is obtained using the photons with energy between the B K threshold and the Cl L pre-edge excitation threshold. The spectator and participant Auger processes are observed at the B 1s→2a2‘(2pπB) and 1s→4e'(σBCl*) resonances. The spectator Auger processes are also observed in the Cl L2,3 excitation region, while the participant Auger processes are not significant in this region. The observed spectra are discussed with the aid of the one-electron properties of the valence orbitals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468289
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic decay processes following the resonance excitation of the B 1s core electron in BF3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3520-3523 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron spectroscopy has been carried out to investigate spectator and participant resonance Auger decay processes following the B 1s→2a2‘ excitation in gaseous BF3 molecules using monochromatized synchrotron radiation. The resonance-enhanced satellite bands corresponding to the spectator Auger electron emission form six broad peaks showing good correspondence with the normal Auger bands. Resonance enhancement of the photolines corresponding to the participant Auger electron emission occurs only for the bonding orbitals having B character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467537
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  • 8
    Electronic Resource
    Electronic Resource
    Far-wing excitation study of the reactions in the Hg–H2 collisional quasimolecules. II. Rovibrational distributions of HgH, HgD (X 2Σ+) formed from Hg–H2, D2, HD (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7474-7479 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have applied the laser-pump/probe and double-beam absorption/dispersion approaches to the far wings of the Hg 3P1–1S0 resonance line broadened by collisions with H2, D2, and HD. Absolute reduced absorption coefficients of the Hg–D2 quasimolecules have been determined as a function of the wave-number shift Δ from the resonance-line center both in the red and blue wings. The nascent rotational distributions have been determined for the v=0 and 1 levels of HgH (X 2Σ+) and the v=0 level of HgD (X 2Σ+) formed from the Hg*(3P1)–H2, D2, and HD collisional–quasimolecular states A˜ and B˜ attained by the red- and blue-wing excitation, respectively. Both of the intermediate states A˜ and B˜ give quite similar rotational distributions peaking around N(approximately-equal-to)18 for HgH and N(approximately-equal-to)25 for HgD insensitive to the excitation-wave-number shift Δ. However, a small difference is found: the red-wing excitation gives larger populations in the low-N levels than the blue-wing one. The departing atom isotope effect is observed in these low-N populations of HgD from Hg–D2 and Hg–HD. The absolute ratio of the nascent yields of v=1 to 0 has been measured to be 0.3, being nearly constant against Δ in both the red and blue wings. These observations indicate that HgH is formed predominantly from a bent H–Hg–H configuration on both the pathways via the A˜ and B˜ states. The different type of transition state, however, may be encountered on the pathways producing the minor components in the low-N levels. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472602
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  • 9
    Electronic Resource
    Electronic Resource
    Far-wing excitation study of the reactions in the Hg–H2 collisional quasimolecules. I. Transit-state selectivity in HgH formation and three-body dissociation (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7464-7473 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser-pump/probe and double-beam absorption/dispersion approaches have been applied to the far wings of the Hg 3P1–1S0 resonance line broadened by collisions with H2. Absolute reduced absorption coefficients of the Hg–H2 quasimolecules have been determined as a function of the wave-number shift Δ from the resonance-line center both in the red and blue wings. Decay probabilities of the excited Hg*(3P1)–H2 quasimolecule into the reactive channel (hGH formation) or into the elastic channel (Hg*(3P1) formation) have been determined as a function of Δ both for the red-wing excited A˜i and blue-wing excited B˜ states. The rest of these decay probabilities have been attributed to three-body dissociation Hg(1S0)+H+H. These results indicate that (a) the A˜-state surface serves more effectively in HgH formation than the B˜-state surface by a factor of about 2.3; but (b) three-body dissociation, in turn, proceeds far more efficiently on the B˜-state surface than on the A˜-state surface. Discussions about the energy barriers and the orbital correlations for HgH formation are presented, based on the Δ dependence of these decaying probabilities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472609
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  • 10
    Electronic Resource
    Electronic Resource
    Femtosecond real-time probing of the ultrafast energy dissipation in the Hg(63P1)–CO van der Waals interaction (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 461-464 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have performed the fs pump–probe experiment on the B˜→a˜ nonadiabatic transition in the Hg–CO vdW complex. It is found that the transition occurs near the point where Hg and CO come nearest to each other on the B˜-state surface with a probability of 0.07 for their single encounter. This experiment serves as the first observation of the wave packet dynamics associated with an intermolecular energy flow in the vdW interaction. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481821
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