共查询到20条相似文献,搜索用时 15 毫秒
1.
《光谱学与光谱分析》2020,(6)
研究Au—O键可以帮助人们更好理解不断发展的金化学科学,而氧化金AuO是含Au—O键最简单的模型,因此对氧化金分子的电子态结构进行研究有重要的科学意义。激光诱导荧光光谱是研究分子结构和化学键的有效手段。利用激光溅射结合超声射流技术产生气相氧化金分子(AuO),采用激光诱导荧光光谱技术测量氧化金在16 500~18 500 cm~(-1)范围内的电子谱。消融激光(Leibao Dawa-300)溅射高纯度(99.9%)金靶产生金原子,将靶材安装在真空步进电机上由步进电机带动转动,保证溅射激光每次打在靶材不同的位置,保证信号的稳定度。高压纯氧气经脉冲阀(Parker, General Valve, series 9)进入真空腔室与金原子反应生成气相氧化金分子AuO。Nd∶YAG激光器(Continuum SureliteⅡ-10)泵浦染料激光器(Sirah, Cobra-Stretch)输出线宽为0.05 cm~(-1)、脉宽为5 ns、能量为0.1 mJ·pulse~(-1)的激光,该激光激发前述产生的氧化金分子至激发态。扫描染料激光器,使用光电倍增管PMT(EMI, ET9202QB)探测此荧光。示波器卡(Picoscope 6404C,500 MHz,14 bits)将光电倍增管探测的信号转换成数字信号输入到计算机,采用基于LabVIEW的分析程序读取信号。分析所测量的光谱,带头在17 152.94, 17 552.17, 17 932.78和18 291.62 cm~(-1)的四个振转谱带被归属为b~4Π_(3/2)(v′=0, 1, 2, 3)-X~2Π_(3/2)(v″=0)跃迁谱。对转动分辨的光谱进行拟合,得到激发态b~4Π_(3/2)态的光谱常数,包括转动常数和离心畸变常数。分析了激发态可能的电子组态,为1σ~21π~41δ~42σ~12π~33σ~(*1)。 相似文献
2.
Study on the A~2Π_(3/2u), B~2Δ_(3/2u), and X~2Π_(3/2g) states of Cl_2~+ including its isotopologues 下载免费PDF全文
《中国物理 B》2015,(8)
Adopting the experimentally available vibrational constants in a recent analysis of the strong perturbation between the A22Π3/2u and BΔ3/2u states of Cl+2in the A–X band system [Gharaibeh et al. 2012 J. Chem. Phys. 137 194317], an unambiguous vibrational assignment of the bands reported previously is carried out. The equilibrium rotational constants Be and α e of the X2Π3/2g and A2Π3/2u states for35Cl+2and35Cl37Cl+and those of the B2Δ3/2u state for35Cl+2are obtained by fitting the experimental values of Bυ. In addition, the values of Be and α e of these three states for the minor isotopologues35Cl37Cl+and37Cl+2are predicted by employing the isotopic effect. The values of equilibrium internuclear distance Re of the three states for the three isotopologues are calculated as well. 相似文献
3.
4.
Ling Wu Xiao-hua Yang Kakule Kaniki Chuan-liang Li Yang-qin Chen 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(1):82-86
The rotationally resolved spectra of the c3Πu–b3Πg system of P2 in the 16620–17860 cm?1 region is reanalyzed here to obtain more assignments of the rotational lines and more accurate molecular constants. Approximately 500 spectral lines were assigned to six subbands: the Ω=0, 1 and 2 components of the (2, 3) band, the Ω=0 and 2 components of the (1, 3) band and the Ω=2 component of the (1, 2) band. Because of perturbations in the c3Πu (υ=2) state, the Λ-doubling in the 3Π2–3Π2 subband of the (2, 3) band was resolved. By the weighted nonlinear least-squares fitting using two types of effective Hamiltonians, more accurate molecular constants for the υ′=1 and 2 levels in the c3Πu state and for the υ″=2 and 3 levels in the b3Πg state of P2 were derived. 相似文献
5.
The 31Πg state of Na2 is experimentally investigated by using high resolution cw optical-optical double resonance spectroscopy. A single line Ar+ laser (total of 9 lines) is used to pump the sodium dimers from thermally populated ground state to the intermediate B1Πu state. Then a single mode Ti:sapphire laser is used to probe the 31Πg state. Violet fluorescence from highly Rydberg excited states (mainly 23Πg or 33Πg states which are transferred from 31Πg state via collisions) to the state is monitored by a filtered photomultiplier tube and a lock-in amplifier. Compared with previous studies [C.C. Tsai, J.T. Bahns, W.C. Stwalley, J. Chem. Phys. 99 (1993) 7417], a wider range of rotational quantum numbers of data field are observed. A set of Dunham coefficients and the Rydberg-Klein-Rees potential energy curve of the 31Πg state are deduced from all the observed rovibrational levels. 相似文献
6.
利用以前我们得到的双原分子的振转波函数,计算了BN分子A3Π-X3Π带系的Franck-Condon因子。计算中转动量子数的值由J=0取至J=180,结果适用于低温、高温和强激波条件。 相似文献
7.
The electronic spectrum of the gaseous gold monoxide molecule has been investigated in the range of 16000-18500?cm?1 using laser induced fluorescence spectroscopy and single vibronic level emission spectra. Five rotationally resolved vibronic bands are observed and assigned to the transitions B2Σ? (v'?=?0-4) -X2п3/2 (v''?=?0), in which the 0-0 transition is observed for the first time. The molecular constants of the excited state B2Σ? are obtained by a rotational analysis of the spectra. The spin-orbit coupling constant and the vibrational constants of the ground state X2пi are determined with the accuracy improved by one order of magnitude. The lifetimes of most observed bands are also measured for the first time. 相似文献
8.
The hf pulse excited Ar + N2 mixtures and early afterglow are investigated at total pressures from 266 to 1995 Pa using nitrogen of 0·05–0·5% concentration. The time-resolved intensity of Ar I atomic lines and N2 (2nd pos., 1st pos. and 1st neg.) band systems exhibit an intense early afterglow (0·3 ms). Both the decay of electron densityn
e and that of molecular Ar
2
+
ions and enhancement of coefficient of dissociative recombination due to electron temperature decrease after the pulse lead to the formation of characteristic secondary maximum of Ar I spectral line and N2 molecular band intensities in the momentt
m after cut-off the pulse. The values oft
m(B3g)>t
m(C3u)>t
m(Ar I) decrease with increasing total pressure and increase with growing concentration of N2 in Ar. In the afterglow period the Ar
2
+
dissociatively recombine in 5p and 4p Ar states. As a result of radiative transitions the metastable Ar (3P2,0) atoms are formed which consequently due to collisions with N2 molecules create electronically excited N2. With increasing nitrogen concentration this effect becomes less pronounced and at concentration of N2 greater than 0·5% it is negligible. 相似文献
9.
ABSTRACTWe have recorded the a4Σ? 3/2 ? X1 2Π3/2 (0,0), (1,0), and (2,0) bands of gaseous gold monosulphide (AuS) at sub-Doppler resolution in the near-infrared region. The molecules were made in a hollow cathode discharge source by the reaction of sputtered gold with carbonyl sulphide. The high resolution of the laser excitation spectrum enabled the determination of molecular constants describing the rotational and 197Au hyperfine structure in both states, as well as the spin–rotation interaction in the a4Σ? 3/2 state. The natures of the two electronic states are discussed in the context of the observed hyperfine structure. 相似文献
10.
Near-infrared emission spectra of the X22Π3/2 → X12Π1/2 fine structure transitions of PbH and PbD have been investigated by high-resolution Fourier-transform spectrometry. The fine structure splitting in the X2Πr ground state of 208PbH was found to be 6924.4926(4) cm−1. Accurate rotational constants for the v = 0 and 1 vibrational levels of the X2Πr states of 208PbH, 207PbH, 208PbD and 207PbD and hyperfine structure constants for the X12Π1/2 states of 207PbH (207PbD) have been derived. 相似文献
12.
The absolute vibrational numbering of the Na2b3Πu state has been established by direct observation of the v = 0–13 levels. These b3Πu levels appear as the lower levels in rotationally resolved fluorescence spectra resulting from OODR excitation of 3Πg, 3Δg, and 3Σg+ states via b3Πu ~ A1Σu+ mixed intermediate levels. The molecular constants for the Na2b3Πu state are (in cm?1, one standard error in parentheses)
13 517.2 (1.3) | 0.1434 (0.0027) | |||||
153.6 (1.1) | 9×10?5 (4×10?4) | |||||
0.47 (0.09) | 3.20 (0.03) Å | |||||
7.85 (0.60) | 0.19 (0.16) |
State | ||||||
0 | 818.7 | 4.2 | — | — | — | |
x ≈ 2272 | 814.1 | 4.3 | 0.35920 | 2.38 | 2.8 | |
21 467.4 | 565.8 | 2.9 | — | — | — | |
x + 18 521.7 | 570.4 | 2.6 | 0.28856 | 1.82 | 2.9 |
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