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  • 1
    Digitale Medien
    Digitale Medien
    Polarization of cyanogen(B2.SIGMA.+-X2.SIGMA.+) emission produced in collision of argon(3P0,2) with bromine cyanide (BrCN) (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 2916-2918 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100259a042
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of silica glasses sintered under Cl2 ambients (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1849-1852 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Chlorine incorporated into silica glasses by sintering porous soot rods under Cl2/He atmosphere or by fabricating with plasma methods were found to be mostly as ≡SiCl, which gives rise to an optical absorption tail above (approximately-equal-to)7.5 eV. The cross section of the optical absorption at (approximately-equal-to)7.77 eV (160 nm) was found to be 1.14×1020 cm2. This value was almost the same as that of ≡SiCl in SiCl4 molecule in the gas phase. A minor fraction (10−3∼10−1) was found to be present as Cl2 molecule, which gives the absorption band at 3.8 eV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348753
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  • 3
    Digitale Medien
    Digitale Medien
    Vacuum ultraviolet absorption spectra and photodissociative excitation of CHBr2Cl and CHBrCl2 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8793-8798 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoabsorption and fluorescence excitation spectra of CHBr2Cl and CHBrCl2 trihalomethanes were measured in the 106–200 nm region using synchrotron radiation as a light source. Main photoabsorption bands observed are assigned as the Rydberg transitions of the outer shell orbitals. In the photoexcitation of CHBr2Cl a diffuse emission band of CHCl(A˜ 1A‘→X˜ 1A') was observed in the 500–800 nm region. The radiative lifetime of the CHCl(A˜ 1A‘) state was first determined to be 7.01±0.25 μs. In the photolysis of CHBrCl2 at 121.6 nm, the formation of CHCl(A˜ 1A‘) and CCl2(A˜ 1B1) radicals were observed. The fluorescence thresholds for CHBr2Cl and CHBrCl2 start at 162 and 159 nm with the maximum yields of 5% and 11% at 122 and 119 nm, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.462286
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  • 4
    Digitale Medien
    Digitale Medien
    Collision energy dependence of the cross sections for production of CN(B 2Σ+) in the reactions of Ar(3P0,2) and Kr(3P0,2) with BrCN (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1011-1019 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Cross sections for the formation of CN(B 2Σ+) in collisions of Ar(3P0,2) and Kr(3P0,2) with BrCN were measured in a crossed beam geometry as a function of the collision energy. An arc-heated metastable rare-gas beam was velocity selected by a time-of-flight method, and the collision energy Ec was varied in the range of 0.7–5.2 eV for Ar(3P0,2) and 1.0–5.2 eV for Kr(3P0,2). The cross sections were found to be proportional to E−mc, with m=0.355±0.008 for Ar(3P0,2) and 0.124±0.010 for Kr(3P0,2). The relative cross sections were normalized against the known absolute cross section for collisional excitation transfer from Ar(3P0,2) to N2. The absolute cross sections thus determined were, for example, 16.0±4.9 A(ring)2 for the Ar(3P0,2)+BrCN system and 42.3±14.8 A(ring)2 for the Kr(3P0,2)+BrCN system at the collision energy of 1.0 eV. The results were explained in terms of the curve-crossing mechanism that an ion-pair [Rg+BrCN−] intermediate state intervenes between the entrance and the exit covalent states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.461180
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  • 5
    Digitale Medien
    Digitale Medien
    Direct absorption spectra of jet-cooled benzene in 130–260 nm (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7700-7706 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The direct absorption spectrum of benzene in a free jet has been measured in the 130–260 nm region (S1, S2, and S3 states, Rydberg series, and the first ionization limit) using synchrotron radiation as a light source. The absolute molar extinction coefficients (ε) of benzene in jets have been determined by scaling measured free-jet values to the known value in the vapor phase for a broadband at 200.1 nm in the S2 state. The vibrational temperature for ν16 mode was estimated to be 185 K. The maximum value of ε of the S1 absorption system was found to be 1400 l mol−1 cm−1 (spectral bandwidth=0.065 nm). A shoulder observed at 205.45 nm in the S2 absorption system is assigned to the S2 origin, induced by pseudo-Jahn–Teller distortion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460155
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  • 6
    Digitale Medien
    Digitale Medien
    Vacuum ultraviolet absorption spectra of thiirane and thietane (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2808-2813 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoabsorption cross sections of thiirane and thietane vapors have been studied in the 110–240 nm region using synchrotron radiation. A number of peaks from thiirane and thietane are arranged into four and five Rydberg series, respectively, converging to the first ionization potential. Many Rydberg peaks from both molecules are observed to possess vibronic structures. The vibrational progressions from thiirane are assigned to the CH2 wagging (ν4) and CS symmetry stretching (ν5) modes. For thietane, the CH2 wagging (ν5) and CS symmetry stretching (ν7) modes of the excited states are found to be active. Molecular geometries and vibrational frequencies for the excited states are discussed on the basis of ab initio calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456949
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  • 7
    Digitale Medien
    Digitale Medien
    Anisotropic velocity distribution of desorbing product in carbon monoxide oxidation on palladium (110) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2783-2789 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Significant anisotropy was found in the velocity distributions of desorbing product CO2 from a Pd(110) surface. The velocity distributions were determined by a cross-correlation time-of-flight technique combined with angle-resolved thermal desorption. Heating the coadlayer of CO and oxygen produces five peaks in the CO2 formation spectrum; P1– (around 420 K), P2– (∼370 K), P3– (∼300 K), P4– (∼230 K), and P5–CO2 (∼170 K). The translational temperature of each CO2 is much higher than the corresponding surface temperature, and increases in the sequence of P1– 〈P2– 〈P3– 〈P4– 〈P5–CO2. It decreases rapidly with an increase in the desorption angle perpendicular to the surface trough and more slowly parallel to it. This anisotropy is correlated to the reaction site symmetry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463070
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  • 8
    Digitale Medien
    Digitale Medien
    Vacuum ultraviolet photochemistry of CHFCl2 and CHFBr2: Absorption spectra and CHF(A˜ 1A‘) radical formation (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4277-4282 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoabsorption and fluorescence excitation spectra of CHFCl2 and CHFBr2 were measured in the wavelength region 106–200 nm using synchrotron radiation as a light source. The Rydberg excitations of the outer shell orbitals are discussed. The He(i) photoelectron spectrum of CHFBr2 was first measured. Diffuse emission band of CHF(A˜ 1A‘→X˜ 1A') was observed in the 350–700 nm region, in which the 2n0 (n=0–4) vibrational progression and 201 transition were identified. The CClF(A˜ 1A‘) radical was produced together with CHF(A˜ 1A‘) in the photodecomposition of CHFCl2. The radiative lifetimes of the A˜ 1A‘ states of CHF and CClF were determined to be 2.57±0.16 μs and 644±15 ns, respectively. In the photolysis of CHFCl2 fluorescence starts at 155 nm and shows a maximum quantum yield Φ=0.22 at 107.5 nm, while the CHFBr2 excitation gives a maximum of Φ=0.016 at 117.5 nm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.457787
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  • 9
    Digitale Medien
    Digitale Medien
    Photoexcitation of M(CH3)2 (M=Zn, Cd, Hg) compounds in the 106–270 nm region (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2797-2805 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption cross sections and fluorescence excitation spectra of group IIb dimethylmetals were measured using synchrotron radiation at 106–270 nm. The observed absorption bands were accounted for in terms of Rydberg transitions. The fluorescence spectra of MCH3 (A˜ 2E→X˜ 2A1) transitions were observed and the radiative lifetimes determined were 47±2 and 62±2 ns for M=Zn and Cd, respectively. The excited M(np 3P01) atoms were detected in the photolyses of dimethylcadmium and dimethylmercury, but not in dimethylzinc. The formations of the electronically excited MCH3 (A˜ 2E) and M(np 3P01) states are characteristic of the Rydberg excitations of the C–H in methyl and M–C bonding electrons, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.457926
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  • 10
    Digitale Medien
    Digitale Medien
    Photochemistry of CCl3F and CCl2F2 in the 106–200 nm region (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6290-6295 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption cross sections and fluorescence excitation spectra of CCl3 F and CCl2 F2 were measured using synchrotron radiation at 106–200 nm. The observed absorption bands were accounted for as Rydberg transitions. The emitters produced from the CCl3 F and CC12F2 photodissociative excitations were attributed to CClF(A˜ 1A‘←X˜1 A') and CF2 (A˜ 1B1 →X˜ 1A1 ) transitions, respectively, and their radiative lifetimes were determined to be 626 ± 28 and 58 ± 2 ns. The emission from the CClF(A) starts at 140 nm and increases to 9.1 Mb at 106 nm, and that for CF2 (A) was deduced to be 0.9 Mb at 104.8 nm. The onsets of the fluorescence suggest that the electronically excited CClF and CF2 radicals are formed by the atomic Cl elimination but not by molecular Cl2 releasing process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456345
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