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
  • 1
    facet.materialart.
    Unknown
    Widespread methane seepage along the continental margin off Svalbard - from Bjørnøya to Kongsfjorden (2017)
    Nature
    In:  EPIC3Scientific Reports, Nature, 7(42997), pp. 1-13, ISSN: 2045-2322
    Details
    Publication Date: 2017-06-20
    Description: Numerous articles have recently reported on gas seepage offshore Svalbard, because of gas emission that may be due to gas hydrate dissociation, possibly triggered by anthropogenic ocean warming. Here we report on findings for a much broader extent of seepage in water depths at and shallower than the gas hydrate stability zone. More than a thousand gas seepage sites imaged as acoustic flares generate a hundreds of kilometer-long plume. Most flares were detected in the vicinity of the Hornsund Fracture Zone. We postulate that the gas ascends from depth along the fracture zone; its discharge is focused on bathymetric highs and is constrained by glaciomarine and Holocene sediments in the troughs. A fraction of this dissolved methane (~1.8%) was oxidized whereas a minor but measureable fraction (0.05%) was transferred into the atmosphere in August 2015. The large scale seepage reported here is not linked to anthropogenic warming.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    High resolution pulsed field ionization–photoelectron study of CO2+(X 2Πg) in the energy range of 13.6–14.7 eV (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 10767-10777 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vacuum ultraviolet pulsed field ionization–photoelectron (PFI–PE) spectra for CO2 have been measured in the energy range of 13.6–14.7 eV, revealing complex vibronic structures for the ground CO2+(X 2Πg) state. Many vibronic bands for CO2+(X 2Πg), which were not resolved in previous photoelectron studies, are identified in the present measurement based on comparison with available optical data and theoretical predictions. As observed in the HeI photoelectron spectrum of CO2, the PFI–PE spectrum is dominated by the symmetry allowed ν1+ (symmetric stretch) vibrational progression for CO2+(X 2Πg). However, PFI–PE vibronic bands due to excitation of the symmetry disallowed ν2+ (bending) and ν3+ (asymmetric stretch) modes with both odd quanta, together with the symmetry allowed even quanta excitations, are clearly discernible. The simulation of rotational contours resolved in PFI–PE vibronic bands associated with excitation to the (ν1+=0–1, ν2+=0–2, ν3+=0) vibrational levels has yielded accurate ionization energies for the formation of these vibronic states from CO2(X 1Σg+). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481721
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A study of the S(^3P"2","1","0; ^1D"2) production in the 193 nm photodissociation of HS and H"2S
    Amsterdam : Elsevier
    Chemical Physics Letters 199 (1992), S. 78-84 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(92)80052-D
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Nonresonant two-photon pulsed field ionization of CH3S formed in photodissociation of CH3SH and CH3SSCH3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5596-5603 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Threshold photoelectron (PE) spectra for CH3S formed in the photodissociation of CH3SH and CH3SSCH3 in the photon energy range of 36 850–38 150 cm−1 have been measured using the nonresonant two-photon pulsed field ionization (N2P-PFI) technique. Both spin–orbit states CH3S(X˜ 2E3/2) and CH3S(2E1/2) are observed from CH3SH and CH3SSCH3 in this photodissociation energy range. However, negligible intensities of vibrationally excited CH3S radicals are produced from CH3SH. In the case of CH3S from CH3SSCH3, the population ratio CH3S(ν3=1)/CH3S(ν3=0) is estimated to be ≈0.18. The simulation of the N2P-PFI-PE spectra reveals that the rotational temperature for CH3S(X˜ 2E3/2,1/2) formed by photodissociation of CH3SH is ≈200–250 K and the branching ratio CH3S(2E1/2)/CH3S(X˜ 2E3/2) is 0.5±0.1. For CH3S(X˜ 2E3/2,1/2) produced from CH3SSCH3, the rotational temperature for CH3S(X˜ 2E3/2,1/2) is ≈800–900 K and the branching ratio CH3S(2E1/2)/CH3S(X˜ 2E3/2) is 1.1±0.2. This experiment demonstrates that the PFI-PE spectroscopic method can be a sensitive probe for nascent rovibronic state distributions of photoproducts. Furthermore, the simulation also shows that the photoionization dynamics of CH3S may involve rotational angular momentum changes up to ±4. The ionization energy and C–S stretching frequency for CH3S+(X˜ 3A2) are determined to be 74 726±8 cm−1 (9.2649±0.0010 eV) and 733±5 cm−1, respectively. The spin–orbit splitting for CH3S(X˜ 2E3/2,1/2) is 257±5 cm−1, in agreement with the literature values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467346
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Rotationally resolved nonresonant two-photon ionization of SH (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8047-8054 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The threshold photoelectron (PE) spectrum for nascent SH formed in the ultraviolet photodissociation of H2S has been measured using the nonresonant two-photon pulsed field ionization (N2P-PFI) technique. The rotationally resolved N2P-PFI-PE spectrum of SH indicates that photoionization dynamics favor the rotational angular momentum change ΔN≤0 with the ΔN values up to −3, an observation similar to that found in the PFI-PE spectra of OH (OD) and NO. The ionization energy for SH(X 2Π3/2) is determined to be 84 057.5 ± 3 cm−1 (10.4219 ± 0.0004 eV). The spin–orbit splitting for SH(X 2Π3/2,1/2) is 377 ± 2 cm−1, in agreement with the literature value. This study illustrates that the PFI-PE detection method can be a sensitive probe for the nascent internal energy distribution of photoproducts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466798
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Direct Identification of Photofragment Structures Formed in the 193 nm Photodissociation of Thiophene (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1760-1767 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a019
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A high resolution pulsed field ionization photoelectron study of O2 using third generation undulator synchrotron radiation (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 8931-8934 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have improved a newly developed experimental scheme for high resolution pulsed field ionization photoelectron (PFI-PE) studies [Hsu et al., Rev. Sci. Instrum. (in press)] using the high resolution monochromatized multibunch undulator synchrotron source of the Chemical Dynamics Beamline at the Advanced Light Source. This improved scheme makes possible PFI-PE measurements with essentially no contamination by background electrons arising from direct photoionization and prompt autoionization processes. We present here a preliminary analysis of the rotationally resolved PFI-PE spectrum for O2 obtained at a resolution of 0.5 meV (full-width-at-half-maximum) in the photon energy range of 18.1–19.4 eV, yielding accurate ionization energies for the transitions O2+(b 4Σg−, v+=0–9, N+=1)←O2(X 3Σg−, v=0, N=1). © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473956
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Rotationally resolved photoelectron study of O2: Identification of the vibrational progressions for O2+(2 2Πu,2Σu−) at 19.6–21.0 eV (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 4701-4704 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: On the basis of rotationally resolved pulsed field ionization photoelectron measurements, we have shown that the weak vibrational progressions in the energy region of 19.6–21.0 eV observed in recent high resolution photoelectron spectroscopic studies of O2 are associated with transitions to the 2 2Πu 1/2 (2 2Πu 3/2) and 2Σu− states of O2+, with ionization energies of 19.6268±0.0005 eV (19.6329±0.0005 eV) and 20.3528±0.0005 eV, respectively. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A high resolution photoionization study of Ne and Ar: Observation of mass analyzed threshold ions using synchrotron radiation and direct current electric fields (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3950-3961 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the high resolution vacuum ultraviolet (vuv) photon source provided by the monochromatized undulator synchrotron radiation of the Chemical Dynamics Beamline at the Advanced Light Source, we have measured the photoionization efficiency (PIE) spectrum for Ne in the energy range of 21.56–21.67 eV at a wavelength resolution of 0.3 meV [full width at half-maximum (FWHM)]. The PIE spectra for Ne obtained using 0.76 and 2.4 V/cm electric fields reveal autoionizing features attributable to the Rydberg states Ne[2p5ns′(1/2)1; n=14–29] and Ne[2p5nd′(3/2)1; n=12–35] converging to the spin–orbit excited Ne+(2P1/2) state. The positions of these Rydberg states are compared to previous experimental results and those calculated using the quantum defects and IE for Ne+(2P1/2) given in Moore [Natl. Stand Ref. Data Ser. Natl. Bur. Stand. 35 (1971)]. We have also observed mass analyzed threshold ions (MATI) for Ne formed in the Ne+(2P3/2,1/2) states. For Ar, only the MATI peak for Ar+(2P3/2) is observed. The failure to observe the MATI peak for Ar+(2P1/2) is attributed to shorter lifetimes of high-n Ar[3p5ns′(1/2)1] and Ar[3p5nd′(3/2)1] Rydberg states compared to the minimum time required for separating the prompt Ar+ ions from the field ionized Ar+ ions in this experiment. The MATI peaks for Ne+(2P3/2,1/2) achieves a resolution of 0.7 meV (FWHM). These MATI spectra for Ne and Ar reported here represent the first such studies made using a cw vuv light source and dc electric fields. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472268
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Improved thermal stability of Mo-modified γ-Fe2O3 particles (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5152-5154 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Acicular α-(FeO)OH particles were synthesized using the chemical coprecipitation method with the reaction system of Fe2Cl2-NaOH. The Mo-modified γ-Fe2O3 particles are obtained by adding the proper amount of sodium molybdate to the solution of geothite, followed by the processes of dehydration, reduction, and oxidation. The thermal stability was investigated by thermal differential analysis. It was found that the transition temperature of γ-Fe2O3→α-Fe2O3 increases from 544 °C for the unmodified particles to 720 °C for particles containing 4% by weight of molybdenum. The improved thermal stability has the advantage that the temperature for the oxidation of Fe3O4 particles can be considerably increased without the risk of forming nonmagnetic α-Fe2O3 particles. The magnetization (σs) and coercivity (Hc) of the magnetic acicular γ-Fe2O3 have been determined from room temperature to 200 °C with a vibrating sample magnetometer. The results indicate that both σs and Hc at room temperature decrease with increasing Mo content. The dependence of Hc can be approximately described by the linear equation Hc=Hc,0(1−AT) over that temperature range. The temperature coefficient A decreases with Mo content until the Mo content reaches 4 wt. %. The origin of improved thermal stability is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344646
    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...