Intensity distribution in the bands of the D1 → X1∑+ system of PbO

Relative integrated intensities of the D1 → X¹∑⁺ system of PbO have been measured by heterochromatic photography photometry. The Morse potential has been employed to compute the Franck-Condon factors and r-centroids. The variation of electronic transition moment R_e with internuclear separation r is found to be R_e(r) = const × (0.54 r − 1) in the range 1.957 ⩽ r, Å ⩽ 2.051. Relative band strengths are derived. The effective vibrational temperature of the source was 6199 K.     

Vibrational–Rotational Analysis of the Hot 2ν2–ν2 Band of the 15NH2D and 15NHD2 Molecules

Optics and Spectroscopy - High-resolution spectra of the $$2{{nu }_{2}}{-} {{nu }_{2}}$$ hot band of the 15NH2D and 15NHD2 molecules are investigated for the first time. The analysis is carried...     

Profile of the ν1 Raman Band of Pure CD4 and Its Mixtures with Ar and Kr in the Gas Phase

The ν₁ band profile of isotropic Raman spectrum of pure CD₄ and its mixtures with Ar and Kr is recorded in the temperature range 140–360 K at pressure of pure CD₄ ranging from 4 to 20 atm and at total pressure of gas mixtures in the interval 4–160 atm. The dependences of the band shape on temperature and density are analyzed. The coefficients of the CD₄ band broadening by Ar and Kr are determined, and the decisive role of vibrational contributions, in particular of the intramolecular energy transfer, is pointed out.     

Electronic Transition Moment Variation in the C2Π–X2Σ+ System of Boron Monoxide

The extensive band system belonging to the C²Π_r–X²Σ⁺ transition of boron monoxide (BO) molecule lying in the vacuum ultraviolet region (150–230 nm) has been recorded in emission in a hollow cathode glow. A few new bands involving high v′ levels of C state have been observed. The Franck–Condon factors and r‐centroids were computed for the C–X system. By correlating the measured intensities to theory, the (relative) variation of the C–X electronic transition moment with internuclear separation was examined.     

Correlation of the R1 and R2 values of gadolinium-based MRI contrast media with the ΔHounsfield unit of CT contrast media of identical concentration

The optimal volume of contrast medium must be injected into the patient who emits the maximum signal intensity in an ROI. This study was investigated four different type MRI and one CT contrast agent in vitro and sought to establish relations between concentration, MRI relaxivity, CT Hounsfield unites selected kVp and different MRI T1 sequences. Using a CT contrast medium and four different MRI T1 contrast media, we developed five different phantom series. The MRI contrast media phantom was imaged on 1.5T and 3T MRI systems and measured the R1 and R2 value. A CT scanner was used to obtain images of the Iopromide 370 phantom with the quality of radiation to obtain images. The Pearson's correlation coefficient analyses were conducted between MRI CM phantom series with Iopromide 370 phantom. The non-parametric statistical analyses were performed for the values of kVp. The ΔHU of the test solution of the CT contrast media was produced in the same amount as the exponentially increased concentration of the MRI contrast media according to the increase in the dilution concentration, and was influenced by the quality of the X-ray. Through the results of this experiment that considered the two aforementioned factors, an image with a high diagnosis value can be acquired from the information on the concentration of the MRI T1 contrast media.     

Intensity anomaly in the A2∑+←X2∏ resonant-(2+2) multiphoton ionization spectra of NO

The two-photon resonant four-photon ionization spectra of NO via A²⁺X² (v=0,1) states have been measured. Some intensity-anomalous lines have been found. Based on the signal-power dependence measurement for the normal and anomalous lines, a double resonance and collision ionization model is suggested to elucidate the intensity anomaly.     

Phase Transition in Ag2S and the Relative Position of Atomic Planes of the α-Ag2S and β-Ag2S Phases

JETP Letters - The relative position of atomic planes of low-temperature monoclinic acanthite α-Ag2S and high-temperature bcc argentite β-Ag2S has been determined from X-ray and electron...     

Correlation of electrical conductivity with Mössbauer and Raman results in the alloy glass g-Ge1−xSnxSe20

The measured electrical conductivity of g-Ge_1−xSn_xSe₂ bulk alloy glasses is shown to be strongly correlated with the behavior of the Sn tetrahedral fraction and the Raman A₁ companion mode amplitude, both of which measure the density of intrinsic defects and which were previously found to be signatures of a molecular cluster network. The correlation is interpreted in terms of the variation with alloying of localized electronic states associated with the structure of this network.     

Study of 1／2 [660] （π^i13／2） Rotation Band in ^179Au

High-spin states in ^179Au have been studied experimentally by using the ^149Sm(^35C1, 5n) reaction at beam energies of 164,~180 MeV. The ^35C1 beam was provided by the tandem accelerator at the Japan Atomic En-ergy Research Institute (JAERI). The target is an isotopically enriched ^149Sm metallic foil of 1.5 mg/cm^2 thickness with a 5.0 mg/cm^2 Pb backing. Measurements of γ-ray excitation functions, X-γ coincidences and γ-γ-t coincidences were performed with 13 HPGe‘s with BGO anti-Compton shields and three LOAX detectors.     

Correlation of the magnetic and transport properties with polymorphic transitions in bismuth pyrostannate Bi2(Sn1 − x Cr x )2O7

Physics of the Solid State - The correlation of the electrical, magnetic, and structural properties of Bi2(Sn1 − x Cr x )2O7 solid solutions has been investigated for two compositions with x...     

SF6 and H2 Broadening and Shifting in the Fundamental Vibrational–Rotational Band of Hydrogen Fluoride

Optics and Spectroscopy - SF6 and H2 broadening and shift of the vibration–rotation lines in the fundamental band of hydrogen fluoride have been investigated. Using mathematical modeling of...     

Radiation Parameters for the Electronic Transition A2Π1/2–X2Σ+ of the Diatomic Exiplex CsXe

Journal of Applied Spectroscopy - The radiation parameters, e.g., Einstein coefficients, oscillator strengths, Frank–Condon factors, and wavenumbers of vibronic transitions in the system of...     

Variation of Satellite Intensity Factors with n in the 1s~2s∈lc→1s~23dnl→1s~2pnl Dielectronic Recombination of Lithiumlike Ions

ＶａｒｉａｔｉｏｎｏｆＳａｔｅｌｌｉｔｅＩｎｔｅｎｓｉｔｙＦａｃｔｏｒｓｗｉｔｈｎｉｎｔｈｅ１ｓ~２ｓ∈ｌｃ→１ｓ~２３ｄｎｌ→１ｓ~２ｐｎｌＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎｏｆＬｉｔｈｉｕｍｌｉｋｅＩｏｎｓ￥ＺｈａｏＬｉｂｏ（Ｉｎｓ?..     

Local Lattice Distortion Around VPb^2- in PbWO4 and the Origin of the 420nm Luminescence Band

The lattice structures around one lead vacancy VPb^2- in PbWO4 are studied within the framework of the fullrelativistic density functional theory. Using the conjugate gradient method, we optimize the geometry of the ions around VPb^2- by moving the ions within the sub-cell until specified tolerance is satisfied. We obtain the geometric positions of ions around VPb^2- after optimization. The calculated results indicate that there would be local lattice distortion caused by the existence of VPb^2-. The electronic structures of both the optimized and pre-optimized PWO containing VPb^2- have been calculated. The density of states of the distorted PWO indicates that the energy gap between the 2p state of O^2- and the 5d state of W^6 is 3.90eV, which shows that the distorted W-O tetrahedron may be the 42Onm luminescence centre.     

Blocking Effect and Moments of Inertia of K = 1／2 Rotational Band in ^171Yb

The K=1/2 rotational band in ¹⁷¹Yb is investigated using the particle number conserving (PNC) method for treating the cranked shell model with monopole and quadrupole pairing interactions. The experimental moments of inertia of ¹⁷¹Yb [521]1/2 (signature α =±1/2) are reproduced well by the PNC calculation, in which no free parameter is involved. The difference in the contribution to the moment of inertia between protons and neutrons is mainly due to the blocking effect of neutron normal orbitals. The ω variation of the occupation probability of each cranked orbital and the contribution to the moment of inertia from each major shell and from each cranked orbital are investigated.     

Rotational Analysis of the 1–4 Band of the B 2Σ+–X 2Σ+ System of 14C16O+

ABSTRACT

High-resolution emission spectrum of the 1–4 band of the B ²Σ⁺–X ²Σ⁺ transition of ¹⁴C¹⁶O⁺ was observed for the first time by conventional emission spectroscopy. The band spectrum was excited in a water-cooled Geissler lamp filled with commercial gaseous carbon monoxide enriched in about 80% of the radiocarbon ¹⁴C. A rotational analysis has been carried out and obtained molecular constants have been merged with previously published data for the B ²Σ⁺–A ²Π_i and A ²Π_i–X ²Σ⁺ transitions. The principal equilibrium constants for the ground X ²Σ⁺ state obtained from this work are ω_e = 2121.7726(98), ω_e x _e = 13.9055(27), B _e = 1.815290(30), α_e = 1.6594(33) × 10^?2, and γ_e = ? 0.377(73) × 10^?4 cm^?1. Also, presently known experimental equilibrium molecular constants of the X ²Σ⁺ states of the CO⁺ isotopic molecules are summarized and isotopic dependence of the B _e and ω _e constants is discussed.     

Self-Broadening Coefficients of CH3D Spectral Lines in the P-Branch of the v2 Band at 2200 cm−1

Abstract

We report the pressure broadening coefficients of 18 lines of the P-branch of the v₂, band of CH₃D near 2200 cm^?1, obtained at room temperature, using a Fourier Transform spectrometer with a resolution of 0.006 cm^?1     

Secondary Collision and the Enhancement of the K+π+ Ratio in the High Energy Heavy-ion Collision

The enhancement of K⁺/π⁺ ratio in the high energy heavy-ion collision is believed to be a possible signature of the quark gluon plasma.Based on the Participant Nucleon Model and the concept of the formation time of secondary particles,the K⁺/π⁺ ratio in the central collision of Si(14.5GeV/c) and Au are calculated by Monte Carlo simulation.The following secondary collisions are considered.πN→K⁺Y、ππ→KK and the single charge exchange reaction between pions and nucleons.The calculation results show that the increased K⁺/π⁺ ratio caused by these secondary collisions is not enough to explain the experimental data observed by the E802 group at BNL.