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
    Electronic Resource
    Electronic Resource
    Electron thermalization times for helium–krypton mixtures (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5980-5981 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron energy relaxation times for a gaseous helium/krypton mixture, calculated with a modification of a formalism reported in previous papers, are found to vary nonlinearly with the mole fractions. Recent experimental results for helium/krypton mixtures are reanalyzed and the previous disaccord of theory and experiment no longer exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454514
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    VUV-optical oscillator strength distributions of C2H6O and C3H8O isomers (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 4276-4279 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoabsorption cross sections of C2H6O isomers (ethyl alcohol and dimethyl ether) and C3H8O isomers (n-propyl alcohol, isopropyl alcohol, and ethyl methyl ether) have been measured in the wavelength region from 30 nm to the ionization potential of each molecule (about 120–130 nm) using an ionization chamber. The obtained photoabsorption cross sections show a maximum value at about 70–80 nm for each molecule. In the wavelength region shorter than about 50 nm, the cross sections are almost the same among isomers and equal to the sum of the cross sections for the constituent atoms. In the longer wavelength region, however, the cross sections show different peaks and shoulders depending on its molecular structure. Especially in the cases of dimethyl ether and ethyl methyl ether vibrational structures of the cross section are observed in the wavelength region from 70 to 100 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451800
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermal electron attachment to carbon suboxide (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4148-4154 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Thermal electron attachment to C3O2 has been studied by the pulse radiolysis–microwave cavity technique. The time variation of electron concentration for mixtures C3O2 with Ar and N2 shows decays with two components and the profile changes significantly depending on both C3O2 and buffer-gas pressures. This can be interpreted by a fast electron attachment to C3O2 to form a compound negative ion in equilibrium with the free electron followed by a slow stabilization of the ion leading to a stable ion. Simulations for the observed decay profiles indicate the presence of two electron attachment–detachment equilibria, one associated with electron and C3O2 and the other including electron, C3O2, and the buffer-gas molecule. The slow stabilization occurs by two-step three-body processes involving intermediate dimer ion. This is supported by a "negative temperature dependence'' observed for the stabilization rates between 270 and 325 K. Though the electron affinity of C3O2 is negative, that of (C3O2)2 is likely to be positive. The role of electron attachment has been discussed in relation to an anomalously large cross section for ionization of a high-Rydberg atom by C3O2 reported previously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456844
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Deexcitation cross sections of He(2 1P) by atoms and molecules (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3623-3628 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The deexcitation cross sections of He(2 1P) by M (M=Kr, Xe, H2, D2, N2, CO, O2, NO, CO2, and CH4) have been obtained by a pulse radiolysis method at a mean collisional energy corresponding to room temperature. The cross sections have been explained fairly well by the Penning ionization process with a long-range dipole–dipole interaction. Bent trajectories appear to be important in the deexcitation by spherical atoms and molecules. An electron exchange process is also suggested to give an important contribution to the total decay width of the transient collision complex in highly excited autoionizing states of (HeM)*.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Ionizing and nonionizing decays of superexcited acetylene molecules in the extreme-ultraviolet region (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4142-4153 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absolute measurements of the photoionization and photodissociation cross sections of C2H2 have been made using continuum monochromatized synchrotron radiation in the 53–93 nm region. The absolute photoabsorption cross section and photoionization quantum yield of C2H2 have also been measured. The excitation spectra of C2(d 3Πg→a 3Πu), C2(C 1Πg→A 1Πu), CH(A 2Δ→X 2Π), and H(Lyman-α) fluorescence have also been obtained. The obtained results have been compared with theoretical calculations. An unresolved problem of the spectral interpretation concentrated on the σ * and π* shape resonances has been clarified by the straightforward demonstration of the photoionization quantum yield. The ionizing and nonionizing decay processes of the superexcited C2H2 molecules have been discussed in view of the strong competition of autoionization and neutral dissociation. An overlapping nature of Rydberg states with the shape resonance is found to be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460770
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Deexcitation of He(2 1P) in collisions with rare gas atoms (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4865-4874 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Deexcitation (Penning ionization) cross sections of He(2 1P) by Kr and Xe have been obtained in a region of mean collisional energy between 18–38 meV by a pulse radiolysis method. Fairly large cross sections of above 100 A(ring)2 and their collisional energy dependence are interpreted by the Penning ionization cross sections based on a long-range dipole–dipole interaction. Validity of the theoretical formula for the Penning ionization cross section (the Watanabe–Katsuura formula) is discussed. Two kinds of the cross sections have been further calculated by means of the impact parameter method with experimentally simulated classical trajectories; in one procedure, the polarization axis of the p-state helium has been assumed to rotate in order to keep collinear or perpendicular configuration with respect to the interatomic axis, in the other procedure, the polarization axis is fixed in a certain direction. The classical motion of the particles have been shown to cause considerable influence on the absolute values and the collisional energy dependence of the cross sections. The influence has increased accordingly to the attractive force of the interatomic potential, i.e., in order of Ar〈Kr〈Xe. Modified form of the dipole–dipole autoionization width with the electron exchange interaction is also discussed. It has also been suggested that rotation of the p-state atomic polarization depends strongly on the van der Waals interaction with the target atoms. The effect of the rotation has been shown to be most prominent for Xe but small for Ar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456580
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Electron–ion recombination rate constants in gaseous, liquid, and solid argon (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 7529-7536 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron drift mobilities μe and electron–ion recombination rate constants kr in gaseous, liquid, and solid argon have been measured by the analysis of transient current induced with the irradiation of an x-ray pulse as functions of temperature and external electric field strength except solid. The effect of external dc electric field on kr up to ∼3×10−3 Td (1 Td=10−17 V cm2/molecule) was examined in gaseous and liquid phases. The observed kr values in both liquid and gas phases were found to be much smaller than those calculated by the reduced Debye equation. The deviation, which is bigger in gas than in liquid, has been compared with recent theoretical studies1–5 which were presented to explain our previous data on the kr values for methane.6 It has been concluded that the recombination also in liquid and gaseous argon is not a usual diffusion-controlled reaction. In the solid phase the observed kr values were almost in agreement with those calculated by the reduced Debye equation. The electron–ion recombination rate constants in both liquid and gas phases increased almost linearly with an external dc electric field up to a critical electric field strength below which electron mobility was nearly constant, and decreased with further increase in the electric field where electron mobility also decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454317
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Electron thermalization processes in a He–Kr bicomponent system and a Ne pure system (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5341-5344 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time evolutions of electron mean energy in a He–Kr bicomponent system and a Ne pure system are observed by means of a pulse-radiolysis microwave-conductivity method, assuming that an electron energy distribution function is always Maxwellian in the energy range from about 100 meV to thermal. Excess electron temperature Te–Tg decays exponentially, whose decay time is defined as a thermalization time. Products of gas pressure and thermalization time are estimated to be 9.7 Torr μs for He, 1.0×103 Torr μs for Ne, and 1.7×102 Torr μs for Kr. The present result for Kr obtained from the He–Kr bicomponent system is in good agreement with that obtained from the Kr pure system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451678
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Thermal electron attachment to van der Waals molecules (O2⋅N2) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 254-259 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron attachment to van der Waals (vdW) molecules (O2⋅N2) has been investigated at temperatures from 77 to 373 K and N2 densities from 2.0×1018 to 3.5×1019 molecules/cm3 using a microwave conductivity technique combined with pulse radiolysis. The initial electron attachment rate constants to O2 and (O2⋅N2) are obtained as k1=(4.2+17−3) ×10−6T1.5 exp(−1017/T) cm3/s and k5=(3.4±0.4)×10−4T−1.5 exp[−(232±12)/T] cm3/s, respectively. The resonance energy for the electron attachment to (O2⋅N2) is reduced to 20±1 meV owing to polarization energy between O−2 and N2. The electron attachment rate constant for (O2⋅N2) is about 103 times larger than that for O2. The reason is: (i) the increase of electron density at the resonance energy for attachment; (ii) the increase of attachment cross section with decreasing the resonance energy; and (iii) that by vdW interaction partial-wave electrons with lower angular momentum can attach to vdW molecules. Since the resonance width for the electron attachment to (O2⋅N2) is larger (800±100 μeV), the (O2⋅N2)−* formed is easy to ionize. Experimental results at high pressures have shown collisional detachment of electrons from (O2⋅N2)−*.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448798
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    VUV-optical oscillator strength distributions of C3H6 and C4H8 isomers (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 4856-4861 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoabsorption cross sections of C3H6 isomers (cyclopropane and propylene) and C4H8 isomers (1-butene, iso-butene, cis-2-butene, and trans-2-butene) have been measured in the wavelength region from 300 A(ring) to the ionization potential of each molecule (about 1200–1400 A(ring)) using an ionization chamber with four ion-collection plates. The obtained photoabsorption cross sections show a maximum value at about 700–800 A(ring) for each molecule. In the wavelength region which is shorter than about 500 A(ring) the cross sections are almost the same among the isomers and equal to the sum of the cross sections for the constituent atoms. In the longer wavelength region, however, the cross sections have different peaks and shoulders depending on an isomer, i.e., on its molecular structure. The obtained cross section values, together with previously reported ones in the wavelength region outside of the present experiment, satisfy the Thomas–Kuhn–Reiche sum rule within experimental errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448655
    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...