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101.
New experimental data on the nu(1) and nu(3) bands of (16)O(3) improving the value of absolute line intensities have been obtained. The intensities of 295 lines have been measured with an average accuracy between 2.5% and 3% and the rotational expansion of the transition moment operators for the nu(1) and nu(3) bands has been deduced. Finally, a complete listing of line intensities has been computed with an intensity cutoff of 1x10(-25) cm(-1)/molecule cm(-2). Copyright 2001 Academic Press. 相似文献
102.
A fit of about 350 rotational levels of the (020), (100), and (001) vibrational states has been performed for H217O as well as for H218O leading to the determination of 51 rotational and coupling constants for each isotopic species. The Fermi-type interaction and the two Coriolis-type interactions have been taken into account by appropriate rotation-vibration operators and the v-diagonal part of the Hamiltonian is, for each vibrational state, a Watson-type Hamiltonian. The results are very satisfactory since 87% of the experimental levels are reproduced within 15 × 10?3 cm?1. 相似文献
103.
V. Malathy Devi B. Fridovich G.D. Jones D.G.S. Snyder Palash P. Das J.-M. Flaud C. Camy-Peyret K. Narahari Rao 《Journal of Molecular Spectroscopy》1982,93(1):179-195
High-resolution spectra in the ν3 region of 14N16O2 were measured by using a diode laser as a source to a vacuum grating spectrometer. Spin-rotation constants for the ν3 and ν2 + ν3 states were determined from the observed data. Absolute strengths and transition moments for the ν3 and ν2 + ν3 ? ν2 bands were derived from the observed line strengths at 296 K. Self-broadened and N2-broadened half-widths were measured for several of the ν3 band lines at room temperature. Temperature-dependent half-widths for two N2-broadened ν3 lines are also reported. 相似文献
104.
Flaud J. M. Arcas P. Camypeyret C. Burger H. Willner H. 《Journal of Molecular Spectroscopy》1995,170(2)
Using a high-resolution Fourier transform spectrum of hydrogen selenide in natural abundance, about 600 intensities of lines belonging to the ν1, ν3, and 2ν2 bands of H280Se were measured. A least-squares fit of these intensities was performed, allowing determination of the vibrational transition moments of these bands and their rotational corrections. Finally, the first derivatives of the dipole moment with respect to the normal coordinates q1 and q3 were found to be ∂μχ/∂q1 = (−0.5938 ± 0.010) × 10−1 and ∂μz/∂q3 = (0.5683 ± 0.010) × 10−1 Debye, respectively. 相似文献
105.
J.-Y. Mandin J.-M. Flaud C. Camy-Peyret G. Guelachvili 《Journal of Quantitative Spectroscopy & Radiative Transfer》1980,23(4):351-370
The self-broadening coefficients of 150 lines belonging to the v2 band of H216O between 1770 and 2250 cm-1 have been measured using Fourier transform spectra (resolution ≈ 0.005 cm-1). The four different methods which have been used to deduce the self-broadening coefficients from experiment are described in detail. The estimated average uncertainty is about 15% and varies from 7 to 30%, depending on the method used and on the line involved. Two theoretical calculations, one based on the Anderson-Tsao-Curnutte method and the other on the recent method proposed by Davies, have been performed, retaining only the dipole-dipole interaction. For some lines of the v2 band and for some pure rotation lines, calculations based on other formalisms have also been performed. For all of these calculations, we have used accurate spectroscopic data: precise energy levels, realistic wavefunctions, and a complete dipole-moment operator expansion in order to compute the transition probabilities. As compared to the previously calculated values of the pioneering work of Benedict and Kaplan, where the Anderson-Tsao-Curnutte method was used, our calculations show improvements by about 14% in the agreement between measured and calculated self-broadening coefficients. 相似文献
106.
For the first time the infrared spectrum of F2BOH in the gas phase has been observed. After optimizing the conditions for the synthesis we have been able to obtain high-resolution (2.4-3.3×10−3 cm−1) infrared spectra in the ν8, ν9, and ν4 regions with both natural and 11B monoisotopic material. Analyses of the ν8 (BF2 out-of-plane bending) and ν9 (OH torsion) fundamental bands located at 684.160 and 522.870 cm−1, respectively, for F211BOH are presented here. Existing J≤10 microwave transitions were combined with novel ground state combination differences with J≤55 formed from A-type (ν4) and C-type (ν8, ν9) bands to yield substantially improved and extended ground state parameters. Using a standard Watson-type Hamiltonian, 81 and 91 upper state parameters were obtained by fitting about 2000 lines each with σ(fit) ca. 3.5×10−4 cm−1. The 81 and 91 states both appear to be unperturbed, as indicated by the agreement of the ground and excited state centrifugal distortion constants. 相似文献
107.
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109.
Alves GA Amato S Anjos JC Appel JA Bracker SB Cremaldi LM Darling CL Dixon RL Errede D Fenker HC Gay C Green DR Jedicke R Kaplan D Karchin PE Kwan S Leedom I Lueking LH Luste GJ Mantsch PM de Mello Neto JR Metheny J Milburn RH de Miranda JM da Motta Filho H Napier A d'Olivera AB Rafatian A dos Reis AC Reucroft S Ross WR Santoro AF Sheaff M Souza MH Spalding WJ Stoughton C Streetman ME Summers DJ Takach SF Wu Z 《Physical review letters》1992,69(22):3147-3150
110.