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1.
2.
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 2Π32-2Π12 (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 ADeBe and γeBe. It is found that ADeBe = (?3.9 ± 1.3) × 10?6 and γeBe = (?4.00 ± 0.05) × 10?3.  相似文献   

3.
4.
With nuclear orientation on 11 h32?189Pt, 2.8 d32?191Pt and 4.0 d132+ 195 mPt in Os and NMR on oriented 189Pt and 191Pt in Fe electric and magnetic hyperfine splitting frequencies were measured. The nuclear moments are deduced to be: 189Pt: |μ| = 0.434(9) μN, Q = ?0.65(26) b; 191Pt: |μ| = 0.500(10) μN, Q = ?0.64(26) b; 195mPt: Q = +1.42(60)b. The negative spectroscopic ground-state quadrupole moments of 189Pt and 191Pt must be due to oblate ground-state deformations, thus indicating that the prolate-oblate phase transition in Pt is located at A < 189.  相似文献   

5.
The A 2Σ+-X 2Π emission spectrum of HCl+ has been measured and analyzed for four isotopic combinations. These analyses extend previous work and provide rotational constants for the v = 0–2 levels of the ground state and for the v = 0–9 levels of the excited state. RKR potentials have been determined for both states, although the upper state could not be fitted precisely to such a model. Calculated relative intensities based on these potentials demonstrated that the electronic transition moment must change rapidly with lower state vibrational quantum number. Although considerable caution should be exercised in applying the concept of equilibrium constants to the A 2Σ+ state, the following are the best estimates of these constants (in cm?1) for the X 2Π state of H35Cl+: Be = 9.9406, ωe = 2673.7, Ae = ? 643.7, and re = 1.315 A?. For the A 2Σ+ state of H35Cl: Te = 28 628.08, Be ~ 7.505, ωe ~ 1606.5, and re = 1.514 A?.  相似文献   

6.
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 I?(1S) + I+(3P1). In combination with other results for the A state, the analysis yields the following spectroscopic constants: Te = 10 907 cm?1, De = 1640 cm?1, ωe = 95 cm?1, R″e = 3.06 A?; Te = 47 559.1 cm?1, ωe = 106.60 cm?1, R′e = 3.53 A?.  相似文献   

7.
It is proved that the quantum mechanical Hamiltonian H = Σi=1N (p2 + m2)12 ? κ Σi>j|xi ? xj|?1 for bosons (resp, fermions) is bounded from below if Ncbκ?1 (resp. N ≤ cfκ?32). H is unbounded from below if Ncblκ?1 (resp. N ≥ cflκ?32). The constants cb and cbl (resp. cf and cfl) differ by about a factor 2 (resp. 4).  相似文献   

8.
The hard photon emission in e+e?μ+μ?γ is investigated to order α3. Formulas for a number of distributions are obtained, when neglecting terms of order (me/?)2 and (mμ/?)2. Both charge-even and charge-odd contributions are calculated. The total contribution to the charge asymmetry parameter
? = [dσ(θ)dOμ+?dOσ(π?θ)dOμ+][dσ(θ)dOμ++dσ(π ? σ)dOμ+]
does not exceed 5% for the c.m.s. energy 2? = 3 GeV.  相似文献   

9.
In lattice gauge theory, many computations such as the strong coupling expansions, mean field theory, or the few plaquette models require the evaluation of the one-link integral in the presence of an arbitrary N × N complex matrix source (J). For SU(N) gauge theories, we express our general solution to the external field problem as an integral over the maximal abelian subgroup [U(1)]N?1
dUe?r(J+U+U+J)=∫i=1Ndøp(Σøi)eS0+InG
where S0 = 2Σkzk cos(φk ? θ), zj are eigenvalues of √JJ+, e2iNθ=detJ/detJ+, and G is an appropriate jacobian determinant. Our explicit solution follows from differential Schwinger-Dyson equations cast in a separable form by using fermionic variables, and the special cases of N = 2, 3 and ∞ agree with earlier derivations.  相似文献   

10.
The branching ratio for producing (πμ) atoms in K0L decay is calculated. Using the approximate solution of the Bethe-Salpeter equation for the (πμ) atom, the S-matrix element of this process is written in a more precise form than that obtained intuitively. Furthermore, all corrections of O(α) (α = e2) are considered. As a result, the branching ratio may be used to determine the form factor ζ = f?(0)/f+(0) of K0L.  相似文献   

11.
The probability distribution calculated for the decay sequence 12ΛB(g.s.) → 12C1π? → αααπ? passing through the (JPN) = (2+, 1) intermediate state 12C1 (16.11 MeV) is cast in a symmetrical form and used to calculate the likelihood for J = 1 relative to J = 2 for12ΛB(g.s.) on the basis of the 85 examples available for this decay process. This procedure has optimum sensitivity, is free from the uncertainties of the comparisons previously made using only projected angular distributions, and strongly indicates that JP = 1? holds for 12ΛB(g.s.). An appendix points out that all the data for the decay sequence passing through the (JPN, T) = (1+, 0) level of 12C1 is well fitted for J = 1 if the J = 1 → Jn = 1 transition amplitude as1 takes a value in the range as1/s = 0.08 to 0.09.  相似文献   

12.
Potential energy curves for the 4Σ+u, 4Πg and 6Σ+g states of N+2 that dissociate to N (4S0) and N+(3P), have been determined from a complete active space self-consistent field calculation. The 6Σ+g state is found to be significantly bound (De = 2.68 eV) with a minimum at 1.72 Å.  相似文献   

13.
The investigation of the emission infrared spectrum of P2 was performed with a high resolution Fourier spectrometer. Two new electronic systems were attributed to b3Πgw3Δu and A1ΠgW1Δu transitions. The molecular parameters are obtained by a complete fitting procedure. The main equilibrium constants of the new states are (in cm?1):
ω3Δu Te = 243228.07 ωe = 591.3 ωeXe = 2.5
Be = 0.256040 δe = 0.001409 De = 19.0 X 10?8
W1ΔuTe = 31096.64 We = 627.206 WeXe = 2.331
Be = 0.2628 δe = 0.0014 De = 23 X 10?8
  相似文献   

14.
Magnetoelastic excitations with a fine structure in the 50kHz range have been observed in the study of the domain wall resonance (DWR) in magnetic garnet thin films. DWR excites standing transverse elastic waves which have a resonance frequency given by f=nv2d, where f is the frequency, n is an integer, v=3.5×105 cm/sec is the transversal velocity of the elastic wave, and d=0.05 cm is thickness of the film/substrate system. A fine structure associated with each of these modes has been identified as due to two dimensional bulk elastic waves by using a set of parallel microstrip lines. The dispersion relation of these elastic waves is ω2=v2(k21+k22), where ω is the radial frequency, k1 and k2 are the wave vectors in the orientation perpendicular and parallel to the sample surface respectively. In the case of k1?k2, f=f0+v2k22f0, where f0 is the resonance when k2=0. The experimental results are in excellent agreement with this model. A linear dispersion, observed when using a shorted slot-line structure, is understood as the excitation of three dimensional modes due to the complex structure of the slot-line and the sample geometry.  相似文献   

15.
Although A′(3Π2) ← X(1Σ+) is forbidden in near case c molecules the A′ ← X transition can be efficiently accomplished by the three-step sequence A′(3Π2) ← D′(2) ← A(3Π1) ← X(1Σ+). Transitions to a range of levels of A′, vA = 2–38, have been recorded by this means, using J-selective polarization-labeling spectroscopy. Principal constants of the A′ state of I35Cl are Te = 12682.05, ωe = 224.57, ωeχe = 1.882, ωeye = ?0.0107, Be = 0.08653, and αe = 0.000675 cm?1. The A′ state is therefore similar in its physical characteristics to two other (relatively) deep states, A(3Π1) and B(3Π0+), of the 2431 configuration.  相似文献   

16.
Nuclear spectroscopic quadrupole moments of the radioactive isotopes 131Cs, 132Cs, and 136Cs have been determined from the hyperfine structure of the 62P32 state by the level crossing method. The results including a Sternheimer correction are: Qs(131Cs) = ?0.625(6) b, Qs(132Cs) = +0.508(7) b, Qs(136Cs) = +0.225(10) b. The quadrupole moments of all the Cs isotopes from A = 131 to A = 137 are recalculated. It is shown, that nuclear quadrupole moments of a specific isotope obtained from different atomic P-states only agree within the limits of error after application of the Sternheimer correction. The increase of Qs with decreasing neutron number conforms with other observations and theoretical calculations stating that for elements around Z = 55 nuclear deformation develops below N = 82. The staggering of the sign of Qs may be interpreted as consequence of an oblate-prolate degeneracy of the nuclear energy surface. Some magnetic moments have been slightly improved: μI(132Cs) = 2.219(7) μN, μI(136Cs) = 3.705(15)μN (corrected for diamagnetism).  相似文献   

17.
For free and interacting Hamiltonians, H0 and H = H0 + V(r) acting in L2(R3, dx) with V(r) a radial potential satisfying certain technical conditions, and for ? a real function on R with ?′ > 0 except on a discrete set, we prove that the Moller wave operators
Ω± = strong limit eit?(H) e?it?(H0)
exist and are independent of ?. The scattering operator
S = (Ω+)1Ω?
is shown to be unitary. Our proof utilizes time independent methods (eigenfunction expansions) and is effective in cases not previously analyzed, e.g. V(r) = sinrr and many others.  相似文献   

18.
From the measurement of Be+e? = Γ(ppe+e?)Γpp→total = (3.2 ± 10?7), obtained in an experiment at CERN with antiprotons at rest, a value of the proton electromagnetic form factors at the threshold of the time-like region is derived: |GE| = |GM| = 0.51 ± 0.08 at q2 = -3.52 (GeV/c)2.  相似文献   

19.
Systems of linear relations for the magnetic moments of the nucleon and transition moments μωπγ, μ?πγ and μN11470Nγ are obtained on the basis of sidewise dispersion relations in the one-pion approximation. In such an approach the magnetic moments of the transition ω(?)→ πγ and N11470→Nγ are expressed in terms of the anomalous magnetic moments of the nucleon and the strong interaction coupling constants.  相似文献   

20.
By generalizing fP universality to Regge-particle “scattering” we obtain sdσdt dM2 = F(sM2,t)[1 + M?1 bf(0)bP(0)] for pp → pX, where bf(t) and bP(t) are the f and P Regge residues for, say, pp → pp. This agrees with the recent NAL data.  相似文献   

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