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1.
2.
The absorption spectrum of the KAr molecule has been observed with high resolution between 13 032 and 13 077 cm−1 using tunable laser diodes as light sources, a supersonic beam for production of the molecules, and laser-induced fluorescence for detection. In addition, optical-optical double resonance (OODR) experiments have been performed to simplify the spectrum and to get rotational assignment. Altogether, 670 lines due to the transition B2Σ+ ← X2Σ+ have successfully been assigned with vibrational levels of the B state ranging from v = 0 to v = 6. The corresponding energy values were fitted to the well-known Dunham expansion. In addition, we were able to analyse a local perturbation between the vibrational level v = 1 of the B state and v = 14 of the A2Π3/2 state. Unexpected extra lines in the OODR spectra are most probably due to a collision-induced population of other levels. For the equilibrium distance and the well-depth of the B state we obtain from the Dunham expansion 7.03 (8) Å and 26.2 (8) cm−1, respectively.  相似文献   

3.
Using laser excitation spectroscopy, 18 red-degraded bands belonging to a single electronic transition of holmium monochloride have been observed in the 615-670 nm region. Thirteen of the bands, with vibrational levels 0?v?3 and 0?v″?4 have been obtained at high resolution and rotationally analyzed. Observation of the first lines in some of the bands has shown that Ω=8 in the ground state and Ω=9 in the upper state. By analogy with HoF, this transition has been labeled as A9-X8. The Ω=8 assignment for the X state establishes the ground state configuration of HoCl as Ho+(4f106s2)Cl, in accord with predictions of Ligand Field Theory. From the rotational analysis, the main equilibrium molecular constants of , for the upper state and , for the ground state have been obtained.  相似文献   

4.
Spectral line emission from the deuterium Balmer α line and from molecular deuterium in the Fulcher band, d3Πu→a3g+, was studied in the outer divertor region of the ASDEX Upgrade plasma with a pair of relatively calibrated spectrometers. A dependence of the signals on the proximity of the plasma strike point and on divertor gas puffing was noted. The rotational spectrum of the lowest diagonal vibrational molecular bands indicated rotational temperatures of ca. 1000 K and hence, through calculation of relative upper state populations, a ground state vibrational temperature of ca. 4000 K. Calculating the particle fluxes, the molecular deuterium was found to contribute up to 1% of the intensity, the relative importance of the molecules at some divertor heights was affected by the position of the strike point.  相似文献   

5.
The electronic spectrum of hafnium monofluoride has been investigated from 415 to 725 nm using a laser-ablation/molecular beam laser-induced fluorescence spectrometer. Several electronic systems were observed and data have been recorded at both low and high resolution. High resolution rotational analyses of the [17.4]1.5-X1.5 (0-0), [17.9]2.5-X1.5 (0-0), [19.7]0.5-X1.5 (0-0), [20.0]0.5-X1.5 (0-0), [21.1]2.5-X1.5 (0-0), [22.3]1.5-X1.5 (0-0), and [23.3]0.5-X1.5 (0-0) subbands have been carried out, resulting in accurate values for the ground and excited state effective rotational constants. Furthermore, the rotational analysis of the subbands assigned as [17.4]1.5-X1.5 (1-0) and [17.9]2.5-X1.5 (1-0) allows us to determine values of 589.7569(6) and 588.9076(6) cm−1 for ΔG1/2 [17.4] and ΔG1/2 [17.9], respectively. From dispersed fluorescence data we find that ΔG′′1/2=670(13) cm−1 for the ground state and that another low-lying electronic state lies at ∼2850 cm−1. The data also suggests that a second low-lying electronic state lies at ∼5200 cm−1 above the ground state.  相似文献   

6.
The infrared spectrum of ν2 of D2S was recorded from 740 to 1100 cm?1 on the University of Denver 50-cm FTIR spectrometer system. We have assigned 655 transitions from D232S and 129 from D234S, and have analyzed them using Watson's A-reduced Hamiltonian evaluated in the Ir representation. We used the recently published D232S and D234S ground state Hamiltonian constants [C. Camy-Peyret, J. M. Flaud, L. Lechuga-Fossat and J. W. C. Johns, J. Mol. Spectrosc.109, 300–333 (1985)]. Upper state Hamiltonian constants were obtained from a fit of the ν2 transitions, keeping the ground state constants fixed while varying the upper state constants. The standard deviation of the D232S ν2 fit is 0.0025 cm?1. The standard deviation of the D234S ν2 fit is 0.0041 cm?1.  相似文献   

7.
States of mixed proton-neutron symmetry are investigated in different dynamical symmetries of the interacting boson model. We discuss in each of the limits the energy spectrum, the wave functions and the B(M1; 01+ → 1 1+) values. We also study three classes of transitional nuclei namely the Pd nuclei [U(5) → O(6)], the Sm nuclei [U(5) → SU(3)] and the Pt nuclei [O(6) → SU(3)] with respect to the energy of the lowest non-symmetric Jπ = 1+, 3+ levels as well as the M1 and M3 strengths for exciting these levels from the ground state. For 98Pd we compare this calculation with a shell-model calculation. Finally, we adress the problem of the mixing of the non-symmetric Jπ = 1+ state with nearby hexadecapole (g-boson) configurations.  相似文献   

8.
A new isomeric state in237Np has been discovered at an excitation energy of (945.3±0.2) keV withT 1/2 =(711±40) ns. Six gamma-ray lines have been measured depopulating the isomeric state to known levels in237Np. The comparison of the measured absolute gamma-ray transition probabilities with empirical values yields as most probable spinI andK assignmentI=K=13/2 for this isomeric state. It is most likely a 1-proton-2-neutron quasiparticle state 13/2?π5/2+ [642] +ν7/2? [743] + ν 1/2+ [631]. However, a one-quasiparticle 11/2? [505] configuration for the isomer cannot be excluded.  相似文献   

9.
In the framework of a potential model we have calculated the various bremsstrahlung cross sections into the5Li ground state, includingM 1 andE 2 γ-transitions leading from the high energy wing of the5Li ground state resonance into states belonging to the same resonance at lower energy (intrastate transition). Our calculation supports the hypothesis of Schmalbrock et al. [1] that intrastate transitions ofM 1 andE 2 multipolarity exist. While we find a maximum cross section of roughly 1.4 nb for theE 2 transition, we predict the cross sections forM 1 intrastate transition to be less than 3·10?5nb. An experimental observation of the intrastate γ-ray emission appears to be very difficult due to the dominance of competing resonant (M 1) and direct (E 1) capture processes. Schmalbrock et al. have suggested to deduce magnetic dipole and electric quadrupole moments of resonant states from the measurements of the respectiveM 1 andE 2 intrastate transitions. We will show that theM 1 intrastate cross sections do not yield the appropriate information to determine the magnetic dipole moment. We will also discuss thatE 2 intrastate transitions do not seem to be a suited tool to find the quadrupole moment of an unstable state.  相似文献   

10.
The nuclear spectroscopy of Gd158 has been investigated by deuteron stripping with magnetic analysis of the resulting protons. Over fifty levels have been observed. Comparison is made of observed and theoretical relative cross sections. Two new rotational bands have been observed; one band based on the 2+ two-quasiparticle state [521 +] – [521?] at 2333.6 keV and a second band based on the 1 + two-quasiparticle state [521 +] – [521?] at 2494 keV. The ground state (d,p)Q-value was found to beQ o=5706± 5 keV.  相似文献   

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