共查询到20条相似文献,搜索用时 399 毫秒
1.
Lue-Yung Chow Chiu Swadesh R. Samanta 《Journal of Quantitative Spectroscopy & Radiative Transfer》1981,25(3):253-264
Photoionization of H2(1Σg+) in a vibrational υ″ and rotational N″ state into H2+(2Σg+) in a vibrational υ′ and rotational N′ state is studied theoretically. The differential cross section, after summing over the final states, is expressed in the well-known simple form of . Parallel expressions are obtained for H2+ in a specific υ′ state (in terms of σ(υ′) and β(υ′)) and for H2+ in a rotational fine level υ′N′ (in terms of σ(υ′N′) and β(υ′N′)). Asymmetry parameters β, β(υ′) and β υ′N′), which are expressed in terms of Racah and Clebsch-Gordan coefficients and electronic transition moments, can be reduced approximately to 2 lineary polarized light and to -1 for unpolarized light. Using single-center electronic wave functions and including partial eaves l = 1, 3, and 5, σ(υ′) and β(υ′) are computed as a function of υ′ at 584 Å. The computed σ(υ′) divided by the Frank-Condon overlap, in agreement with experimental results, increases monotonically with υ′; σT and β are computed in the incident photon energy range of 600–4000 Å and the results compare favorably with previous calculations. 相似文献
2.
The stability of soliton solutions to the nonlinear Schrödinger equation iψt + ψxx + β|ψ|νψ = 0 is investigated for arbitrary positive ν. 相似文献
3.
U.D. Prahllad B.N. Murthy N.S. Murthy 《Journal of Quantitative Spectroscopy & Radiative Transfer》1982,28(1):71-74
Relative integrated intensities of the (AO+?X1Σ+) band system of PbO have been measured by photographic photometry. These have been interpreted with the aid of Franck-Condon factors (qυ′υ″) and r-centroids () to show that the variation of electronic transition moment with internuclear separation is Re(r)=const.(0.521r?1). Arrays are shown for the band strengths Sυ′υ″. 相似文献
4.
S. Eliezer 《Physics letters. [Part B]》1974,53(1):86-88
Assuming an SU(4) group for leptons together with the dynamical equation ( is the projection of the representation z from the direct product z ? z) for the symmetry breaking, we predict: and a Weinberg angle . 相似文献
5.
G.M. Lawrence S.C. Seitel 《Journal of Quantitative Spectroscopy & Radiative Transfer》1973,13(8):713-716
Relative oscillator strengths in the Cameron system of CO(a3Π ← X1Σ) have been observed in absorption for six bands (υ′ = 0–5, υ″ = 0) with the result, normalized to the absolute (0, 0) band measurement of Hasson and Nicholls, , , , , , . The density of CO was modulated with a motor-driven vacuum valve and synchronous fluctuations (?1 per cent) in the transmitted intensity detected with a lock-in amplifier. Peak pressure in the 21 cm absorption cell was approximately 10 torr. A curve of growth analysis was used to correct saturation effects by less than 3 per cent. 相似文献
6.
C.T. Sachrajda 《Physics letters. [Part B]》1981,98(4):261-264
In grand unified theories higher order contributions to the effective potential contain terms of the type where λ is some Higgs coupling and υ1, υ2 are the vacuum expectation values of certain scalar fields whose ratio we require phenomenologically to be extremely large ( or so). We study these terms in a toy model and find taht they can be absorbed into suitably defined coupling constant whose evolution equations (in this leading logarithm approximation) seem to indicate that no natural large hierachy is possible. For consistency of the calculation, however, certain “non-leading” terms must also be included and then it is found that the evolution equations have to be reinterpreted, suggesting a very natural explanation of the large ratio of vacuum expectation values. 相似文献
7.
Zhao Zhiyong 《Nuclear Physics B》1983,212(2):224-236
The phenomenological predictions of the SO(10) supersymmetric grand unified model (SO(10) SGUM) for the mass scales M1, M2, weak angle ifsin2θw, quark-leptons mass ratios , , and proton lifetime τp are estimated by using renormalization group analysis at one-loop level. In contrast with SU(5) SGUM, we find that the SO(10) SGUM still has problems with τp but not with sin2θw and , which may suggest that supersymmetry would be bro at a mass scale . 相似文献
8.
J. Heintze G. Heinzelmann P. Igo-Kemenes R. Mundhenke H. Rieseberg B. Schürlein H.W. Siebert V. Soergel H. Stelzer K.-P. Streit A.H. Walenta 《Nuclear Physics B》1979,149(3):365-380
The decay K+ → e+υγ has been investigated. For the structure-dependent part with positive γ-helicity (SD+) the branching ratio is obtained from 51 ± 3 events observed in the kinematical region Ee ? 235 MeV, Eγ > 48 MeV and θeγ > 140°. For the corresponding part with negative γ-helicity we obtain an upper limit Γ(SD?)/Γ(SD+) < 11 (90% CL) from the sample of electrons with energies 220 MeV ? Ee < 230 MeV and with no γ in the backward direction. This upper limit implies that the ratio of structure-dependent axial vector amplitudes lies outside the region .For the decay the limit 90% confidence level) was found. 相似文献
9.
The (1-0), (2-0), and (3-0) transitions of 15N16O and 15N18O are investigated. The wavenumbers of the rotation-vibration lines are reported for the overtone bands and the (1-0) subband. It is shown that in the data reduction it is advantageous to calculate first merged spectroscopic constants ignoring the Λ-type doubling. The vibrational constants ωe, ωexe, ωeye and the vibrational dependence of the rotational constants are determined. The study of 15N18O allows the determination of the equilibrium values of the centrifugal distortion correction ADe to the spin-orbit constant and of the spin-rotation constant γe from the isotopic invariance of the ratios and . It is found that and . 相似文献
10.
A weak emission spectrum of I2 near 2770 Å is reanalyzed and found to to minate on the A(1u3Π) state. The assigned bands span v″ levels 5–19 and v′ levels 0–8. The new assignment is corroborated by isotope shifts, band profile simulations, and Franck-Condon calculations. The excited state is an ion-pair state, probably the 1g state which tends toward . In combination with other results for the A state, the analysis yields the following spectroscopic constants: T″e = 10 907 cm?1, ″e = 1640 cm?1, ω″e = 95 cm?1, ; T′e = 47 559.1 cm?1, ω′e = 106.60 cm?1, . 相似文献
11.
Calculations of vibrational and rotational level spacings of homonuclear inert gas diatomic molecules by numerical integration of the radial Schrödinger equation are presented. The potentials which were used for the ground states of Ar2, Kr2, and Xe2 were obtained from accurate fits to the molecular beam scattering data. From the calculated and Bv's, the following spectroscopic constants (in cm?1) were fitted: for Ar2ωe = 31.92, ωexe = 3.31, ωeye = 0.11, Be = 0.060, αe = 0.004; for , , , , ; for , , , , . 相似文献
12.
C.A. Piketty 《Nuclear Physics B》1974,68(1):44-65
We have evaluated the parity-violation contribution in atoms in the framework of SO(3) gauge theory. Various hadronic models have been used: first, for simplicity, the unrealistic five-quark one, next, others involving three ordinary SU(3) triplets for which all unwanted strangeness-changing processes are suppressed, up to order . In the free quark approximation, we obtain quite similar parity-violation effects which are proportional to (ΔM2 is the difference of squared masses of leptons (MX02 ? Mν2 = MX02), or of quarks (ΔMq2)). Namely, in large atoms (Z ? 1) the electronic contribution which is proportional to gives the largest effect (are the spin, momentum operators and mass of the lepton). Parity-violating effects in SO(3) gauge models are ?10?4 smaller than those evaluated in the Weinberg theory with a neutral parity-violating current and will remain undetectable in the near future. 相似文献
13.
A millimeter-wave spectrometer having a sensitivity of 4 × 10?10 cm?1 in the 2-mm region has been constructed for observation of extremely weak millimeter-wave spectra of gases. It has been used to measure J → J, K = 0 ← 3 transitions in PH3 and J → J, K = 0 ← 3 as well as K = ±1 ← ±4 transitions in PD3. The B0 and C0 spectral constants (in MHz) are: for PH3, B0 = 133 480.15 ± 0.12 and C0 = 117 488.85 ± 0.16; for PD3, B0 = 69 471.10 ± 0.03 and C0 = 58 974.37 ± 0.05. The effective ground-state values obtained for the bond angle and bond length are: for PH3, and ; for PD3, and . The corresponding zero-point-average values were calculated to be: for PH3, and ; for PD3, and . For both species, the equilibrium values are and . 相似文献
14.
A. Possoz Ph. Deschepper L. Grenacs P. Lebrun J. Lehmann L. Palffy A. De Moura Gonçalves C. Samour V.L. Telegdi 《Physics letters. [Part B]》1977,70(2):265-268
The helicity, h?, of μ? in π-decay has been determined as positive (h??+0.90) from the average polarization, Pav≡〈JB·sμ〉, of 12B produced in the reaction. We obtain also dynamical information on μ-capture: (i) the weak magnetism form factor, μ=4.5±1.1, and (ii) the sum of the induced pseudoscalar (gp) and the 2nd class induced tensor (gT) couplings versus gA, (. The latter result, adopting the “canonical” value of , leads to which is compatible with zero and in strong contradiction with the value ?—6 recently advocated by Kubodera, Delorme and Rho. 相似文献
15.
We show that the long time behaviour of the velocity correlation function in a two-dimensional classical system with pairwise repulsive potentials can be represented by a series expansion of the form , where t0 is mean free time between collisions. To lowest order in the density an exact expression has been obtained for d1 employing the kinetic theory ofsystems with hard-core interactions. The significance of the series is discussed at low and intermediate densities. 相似文献
16.
John Lekner 《Physica A》1982,112(3):544-556
We derive comparison identities for waves satisfying the equation d2Ψ/dz2+q2(z)Ψ=0. One of these identities is used to show that to second order in the product (wavenumber component normal to interface) × (interface thickness), the reflection amplitude is given by , where l is a legnth determined by the deviation of the interface profile from a step, and q1, q2 are the normal components of the wave numbers in media 1 and 2 on either side of the interface. For the continuous interfaces discussed, l is about two-fifths of the 10–90 interface thickness. The corresponding formula for the transmission amplitude is . 相似文献
17.
G.R. Burleson W.B. Cottingame S.J. Greene S. Stuart E.W. Hoffman J.J. Jarmer I.P. Auer W.R. Ditzler D. Hill K. Imai H. Spinka R. Stanek K. Toshioka D. Underwood R. Wagner A. Yokosawa 《Nuclear Physics B》1983,213(3):365-370
Measurements of CLL of pp elastic scattering near θc.m. = 90° at thirteen energies between 300 and 800 MeV are reported. These, together with previous values of CNN, are used to extract values of two quantities, and , which contain only spin-singlet and only coupled spin-triplet partial waves, respectively. The curve, which is not dependent on CLL, exhibits the behavior expected for the previously conjectured 1D2 resonance. The curve also exhibits a resonance-like behavior, which could be due either to the 3P0 or the 3P2 partial wave. 相似文献
18.
About ScienceDirect 《Nuclear Physics A》1981,370(3):505-506
The penumbra of the profile function describing the nuclear collisions of relativistic heavy ions is related to the cross section for their producing a specific target-nucleus γ-ray, σγ. The analysis assumes that the diffuse-edge diffraction model suffices to calculate the inelastic cross sections to the particle-stable states of the target nucleus. When the deformation lengths, , characterizing all important excitations are available from other experiments and the γ-branching of these states is also known, the only unknown quantity determining σγ is found to be the ratio of the diffuseness parameter of the profile function, d, to its radius, . The most reliably determined values of , for the target 40Ca, imply a rather wide penumbra, consistent with microscopic calculations. 相似文献
19.
Accurate SCF computations are reported on the Rydberg states of N2 of electron configurations , , and ---3σg2πg, also on the valence states of the configuration . The Rydberg state calculations supplement those of Lefebvre-Brion and Moser. A comparison is made between the states and the parallel set of states of the configuration. This comparison shows a sharp difference in the 1Σ+ states of the two configurations, the 1Σ+ state being very high in the latter but relatively low in the former configuration. Recknagel coefficients are given for the several states of the two configurations; as expected, these are much smaller for the configuration. Also, the 1Δ state is relatively lower for the latter configuration. 相似文献
20.
Robert S. Mulliken 《Journal of Molecular Spectroscopy》1976,61(1):92-99
Predissociations in the y1Πg and Rydberg states of N2 (configurations and , respectively) and their likely causes, are discussed. Peaking of rotational intensity at unusually low J values, without sharp breaking off, is interpreted as due to case c? or case ci predissociation. Λ doubling in the y state, attributed to interactions with the state and with another, 1Σ+, state of the same electron configuration as x, is analyzed. From this analysis the location of the (unobserved) state, here labeled x′, is obtained. It is concluded that the predissociation in the Π+ levels of the y state is an indirect one mediated by the interaction with x′ coupled with predissociation of x′ by a state dissociating to atoms: combined, however, with perturbation of the y state by the k1Πg Rydberg state (configuration ), whose Π+ levels are completely predissociated. 相似文献