Library

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
    3-Methyl-2H-1-benzopyran potassium channel activators (1991)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 34 (1991), S. 3074-3085 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00114a017
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hydrazoic acid(~A1A'') hypersurface at excitation energies of 4.0-5.0 eV (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 6104-6111 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100169a013
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Vector correlations in the photofragmentation of HN3 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6548-6555 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Hydrazoic acid was excited to its lowest electronic excited state A˜ 1A‘ and the fragments were analyzed by high resolution Doppler spectroscopy. The NH fragment is rotationally cold, while N2 is strongly internally excited fint(N2)=0.48. The Λ doublets are populated statistically. The alignment of NH rotation vs the transition dipole moment of the parent is low (βμJ≤0.14). The vector correlation between the translational (vNH) and rotational (JNH) motion of the NH fragments is positive and increases with increasing JNH, indicating a preferential parallel alignment of vNH and JNH(βvJ(approximately-equal-to)0.40). The observed correlation between the transition dipole moment of the parent and the NH(1Δ) recoil velocity is negative at low NH rotations [βμv(JNH=2)=−0.4] and increases to positive values with increasing JNH. The HN3 distorts from a nonplanar configuration after excitation of a linear-bent electronic transition in the NNN framework, resulting in a strong N2 rotation and relatively weak NH rotation. The upper potential surface must be dependent on the torsional angle of the NN–NH system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458290
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Joint product state distribution of coincidently generated photofragment pairs (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 411-419 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The joint product state distribution of coincident fragment pairs formed in the same elementary photodissociation process has been determined. This correlation between quantum state populations of two molecular products has been measured by high resolution Doppler spectroscopy in conjunction with level-specific detection of the ejected photofragments. One product molecule, formed in a specific quantum state, is excited by laser induced fluorescence and the wing of the corresponding Doppler profile is analyzed to determine the product state distribution of the partner fragment. In the photodissociation of jet-cooled hydrogen peroxide at 193 nm two OH partner radicals are formed with comparable angular momenta. For a specific rotation of one hydroxyl radical the product state distribution of the partner fragment is centered at about the same rotation with a width of only a few rotational quanta. The orbital angular momentum is of the order of 1 (h-dash-bar) and the impact parameter is extremely small. Experimentally observed joint product state distribution and trajectory calculations on ab initio potential energy surfaces are in excellent agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458443
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Influence of H2O2 internal motion on scalar and vector properties of OH photofragments (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 345-354 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The formation of ground state OH(X) radicals from the photolysis of jet cooled H2O2 at 193 nm is studied by Doppler and polarization spectroscopy. The features of the process are characterized by a complete analysis of the scalar and vector properties of the fragments. In the dissociation process 85% of the available energy is released into fragment translation. The remaining part emerges as rotational excitation that performs a narrow Gaussian-like distribution peaking at N=12 with a FWHM of ΔN(approximately-equal-to)5. The vector correlations between the transition dipole moment μ of the H2O2 and recoil velocity v as well as angular momentum J of the products were evaluated in terms of four bipolar moments. The observed 〈μ ⋅ v〉 correlation was used to determine the state specific contribution of both the A˜ 1A and B˜ 1B dissociative states to the overall product rotational distribution. On the average, 65% of the OH fragments are formed via the 1A state. A comparison of data obtained from the photolysis of room temperature and jet cooled H2O2 molecules indicates that transfer of parent rotation causes a symmetric broadening of the product distribution and a small increase in the 〈v ⋅ J〉 correlation [βvJ(T(approximately-equal-to)20 K)=0.5, βvJ(T=300 K)=0.7] of the fragments. In order to describe the influence of initial parent motion on the product state distribution and on vector correlations a model is used where the formation of two OH radicals in the same microscopic event is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455474
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The influence of vibrational and translational motion on the reaction dynamics of O(1D)+H2(1Σ+g,v) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7490-7499 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The OH product state distribution from the reaction O(1D)+H2(v)→OH(v‘,J‘,Ω,Λ)+H was determined by laser-induced fluorescence (LIF) in the Δv=−3 band for v‘=3 and 4 with resolution of the J‘, Ω, and Λ sublevels. The rotational state population distribution is inverted strongly in v‘=3, weaker in v‘=4. There is a higher propensity for production of OH in the Π(A') Λ-sublevels. Vibrationally excited H2 was used for a part of the experiments. Excitation was achieved by stimulated Raman pumping (SRP). The population ratio of the vibrational states was determined to be P(v=3)/P(v=4)=3.5 for the reaction with H2(v=0) and 3.0 when there is H2(v=1) in the reaction chamber. Higher OH product states are populated than it would be expected from the mean available energy of the reaction. The translational energy of the reactants is transferred into OH rotation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462400
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Influence of the electronic asymmetry in NH (1Δ) state Λ doublets on the photodissociation dynamics of HN3 and DN3 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 422-432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The influence of the electronic asymmetry in the 1Δ(A') and 1Δ(A‘) Λ doublets of NR (R=H,D) on the photodissociation dynamics of hydrazoic acid (RN3) has been investigated. Hydrazoic acid was prepared in its first excited electronic state, A˜1A‘. A variety of scalar (internal state and translational energy distribution) and vectorial (angular distribution, rotational alignment, correlation between translational and rotational motion) properties of the ejected NH or ND fragment were analyzed by Λ-doublet-specific Doppler profile measurements. While the population of the 1Δ(A') and 1Δ(A‘) states are equal, the vector correlations for both Λ sublevels are different. NR(A‘) products are preferentially ejected in the original plane formed by the parent, and the recoil of NR fragments in the symmetric Δ(A') state is preferentially perpendicular to that plane. The vector correlation between the translational and the rotational motion of the fragment also indicates a strong nonplanar dissociation geometry for NR products in the Δ(A') state. About 50% of the ND(A') product rotation is generated by a torsional motion, while 80% of the ND(A‘) fragments are formed with J being aligned perpendicular to the recoil direction (MJ=0).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462477
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A nomenclature for Λ-doublet levels in rotating linear molecules (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1749-1753 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: It is proposed that the two Λ-doublet levels of linear molecules with nonzero electronic orbital angular momentum be labeled Λ(A') and Λ(A‘), e.g., Π(A') and Π(A‘) for Π states, etc., according to the following prescription: All series of levels in which the electronic wave function at high J is symmetric with reflection of the spatial coordinates of the electrons in the plane of rotation will be designated Λ(A') for all values of J, and all those for which the electronic wave function is antisymmetric with respect to reflection will be denoted Λ(A‘). It is emphasized that this notation is meant to supplement, and not replace, the accepted spectroscopic e/f labeling and the parity quantum number. The utility of the Λ(A')/Λ(A‘) notation is that it is of most relevance in the mechanistic interpretation of reactive or photodissociative processes involving open-shell molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455121
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Stereospecific hydroxyl proton spin-spin coupling in a primary alcohol (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 6246-6247 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01024a070
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance investigation of secondary valence forces. II. Intramolecular mercury-halogen coordination in 3-halopropylmercury compounds (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 5131-5136 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01021a014
    Library Location Call Number Volume/Issue/Year 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...