Library

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
    s.l. : American Chemical Society
    Journal of the American Chemical Society 101 (1979), S. 3492-3497 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 103 (1981), S. 6818-6823 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 2659-2660 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 392-395 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 11-16 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0392-6737
    Keywords: Molecular spectra ; grouped by wave-length ranges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati osservati gli spettri rotazionali di ONF negli stati vibrazionali eccitati (100), (010) e (001), determinando cosé le corrispondenti costanti d'interazione vibro-rotazionale α. L'analisi di 156 transizioni rotazionali dello stato vibrazionale fondamentale ha fornito valori accurati di tutte le costanti sestiche di distorsione centrifuga. Sia le costanti d'interazione vibro-rotazionale α che le costanti sestiche di distorsione centrifuga sono state utilizzate per determinare, con procedura ai minimi quadrati, la parte cubica del campo di forza del fluoruro di nitrosile. Calcoliab initio hanno fornito ragionevoli assunzioni per i tre termini cubici della funzione energia potenziale che non sono direttamente determinabili dai dati sperimentali disponibili.
    Abstract: Резюме Наблюдаются ротационные спектры ONF в (100), (010) и (001) возбужденных вибрационных состояниях. Определяются соответствующие вибрационноротационные α постоянные. Аналие 156 ротационных переходов из основного вибрационного состояния дает точные значения всех постоянных центробежной дисторсии шестого порядка. Вибрационно-ротационные α постоянные и постоянные центробежной дисторсии шестого порядка используются для определения, с помощью метода наименьшиь квадратов, кубической части силового поля ONF. Сначала вычисления дают надежные ограничения для трех кубических членов в функции потенциальной энергии, которые не могли быть определены ранее из имеющихся экспериментальных данных.
    Notes: Summary The rotational spectra of ONF in the (100), (010) and (001) excited vibrational states were observed and the corresponding vibrationratation α constants determined. A centrifugal-distortion analysis of 156 ground-state rotational transitions yielded accurate values of all the sextic centrifugal-distortion constants. Both vibration-rotation α constants and sextic centrifugal-distortion constants were used to determine, by least-squares methods, the cubic part of the general valence force field of nitrosyl fluoride. Anab initio calculation provided reliable constraints for the three cubic terms of the potential-energy function which are not directly determinable by the available experimental data.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 45-54 
    ISSN: 0392-6737
    Keywords: Specific calculations and results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si mostra come calcolare elementi di matrice che governano l’assorbimento bifotonico in molecole partendo da funzioni d’onda approssimate come sviluppi CI per la parte elettronica o splines cubiche per quella vibrazionale. Sono state fatte applicazioni alle transizioni2Σ+ A←2∏X di OH e1Σ g + E,F←1Σ g + X di H2 usando i metodi seguenti: I) somma sugli stati nell’approssimazione di Born-Oppenheimer con inclusione delle funzioni d’onda vibrazionali e 2) soluzione diretta dell’equazione della teoria delle perturbazioni per mezzo di uno sviluppo CI a nuclei fissi seguita da una media vibrazionale. I risultati sono stati paragonatti ai dati sperimentali e discussi.
    Notes: Summary We show how conventional linear expansion techniques for both electronic and vibrational wave functions can be used for the computation of matrix elements governing the two-photon absorption probability in molecules. In particular, the2Σ+ A←2∏X transition matrix elements of OH and the1Σ g + E,F←1Σ g + X of H2are computed using 1) the sum over states in the Born-Oppenheimer approximation with inclusion of vibrational wave functions, 2) solution of perturbation theory equations by expansion in the CI basis at fixed nuclei, followed by a kind of vibrational averaging. The results are compared with experiment and discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0392-6737
    Keywords: Corrections to electronic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È ben noto che l'efficienza dei convertitori fotochimici e fotobiologici dipende dalle proprietà spettrali della radiazione incidente. In questo lavoro si analizza l'efficienza di lungo periodo di sistemi con immagazzinamento interno d'energia nel caso di convertitori con uno o due fotosistemi e sezione d'urto d'assorbimento gaussiana. Si discute quindi la dipendenza dell'efficienza dal livello energetico della banda d'assorbimento del sistema e dalle perdite d'energia nella reazione d'immagazzinamento. I risultati ottenuti sono infine paragonati con il comportamento di alcuni dispositivi reali. In particolare, si paragona lo spettro d'assorbimento teorico che rende massima l'efficienza di conversione con lo spettro d'assorbimento sperimentale dei batteri purpurei e delle piante verdi. Anche se questo schema non prende in considerazione la piena complessità delle reazioni fotosintetiche, esso è sufficiente a mostrare che lo spettro d'assorbimento dei convertitori fotosintetici si è adattato alla radiazione solare incidente in modo da ottenere la massima efficienza di conversione.
    Abstract: Пезюме Известно, что зффективность фотобиологических преобразователей зависит от спектраляных свойств падающего излучения. В этой статье анализируется эффективность аккумулирующих устройств с гауссовым поперечным сечением поглощения в случае преобразователй с дной или двумя фотосистемами. Затем обсуждается зависимость от энергетической запрещенной зоны системы и от энергетических потерь в накопиаеле. В частноти, слектр поглощения, который максимизирет эффективностя преобразования, сравнивается с эксперименталяным спектром поглощения пурпурнын бактерий и зеленых станций. Даже беа учета всей сложности фотосинтетических реакций, показано, что спектр поглощения фотосинтетичетических преобразователей, согласванный с падающей солхечной радиацией, дает наивысшую эффективность преобразования.
    Notes: Summary An algorithm has been implemented for the evaluation of one-electron density matrices from correlated wave functions obtained by using a variation-perturbation procedure recently proposed, which allows the inclusion of several reference configurations. The algorithm has been applied to evaluate the dipole moment and the chlorine and nitrogen quadrupole coupling constants of the NSCl molecule.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8764-8770 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A study of the Li+HCl reaction has been carried out using classical trajectories. A comparison with detailed scattering data has given sufficient indications on the accuracy of the overall shape of a previous bond order potential energy surface derived from ab initio values. Calculations performed on a new bond order surface having a lower transition state has led to a more realistic estimate of the threshold energy and the ratio between high and low collision energy reactive cross sections. The comparison has been extended to rate constants. Calculated values agree with measured ones within the given error boundaries
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 7303-7305 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new ab initio evaluation of the Li+HF potential energy values at the stationary points of the reaction channel is presented and compared with results of a previous calculation and estimates derived from empirical considerations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...