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1.
报道Cs原子里德伯态Stark能级场电离阈值与|m_l|依赖关系的实验研究结果,从实验上同时测得Cs原子|m_l|=0,1,2三种态的电离阈值表达式。  相似文献   

2.
本文利用流动余辉技术研究了亚稳态原子He(2^3s)和Ne(^3p0.2)与POCl3分子的传能反应,获得了激发态碎片PO(A)和PO(B)的发射光谱,测定了He(2^3s)与POCl3反应中PO(A)和PO(B)的形成速率常数,其数值分别为:KPO(A)=3.68×10^-11cm^3·molecule^-1S^-1和KPO(B)=9.40×10^-11cm^3·molecule^-1·S^-1  相似文献   

3.
自由基和激发态原子分子反应装置   总被引:3,自引:1,他引:2  
自由基和激发态原子分子反应装置是一台综合了分子束技术,激光诱导荧光技术,共振多光子电离技术及质谱和化学发光光谱测量技术相结合的功能比较齐全的分子反应动力学研究装置。利用稀有气体(He,Ar,Xe)亚稳态与N2,CS2等分子碰撞传能发射光谱测量及C(^3P)+N2O(X^1Σ^+)反应产物CN(X^2Σ^+,V^n)的激光激发谱测定证实了这台装置具有良好的工作性能。并将装置分为超音束源,质谱室及激光  相似文献   

4.
本文报道了三光子共振条件下CO的A^1П←X^1Σ^+跃迁的多光子电离光谱。并研究了谱线强度的反常压力效应以及谱线的位移和不对称加宽。通过园偏振激光实验,证实了此光谱来源于CO分子吸收其自身介质中的激光诱导的三次谐波;并利用相位匹配条件在理论上解释了实验中所观察到的谱线强度的反常压力效应。与此同时,研究了ACStark效应引起的谱线位移和不对称加宽。并首次对此效应进行了定量计算,其结果和实验观测值  相似文献   

5.
邓宏贵  林榕 《光学学报》1998,18(10):464-1466
用共振多光子电离光谱技术,检测钠分子X^1∑^+g→2′Пg在16574.5cm^-1~16590.5cm^-1之间的共振电离信号激发谱,根据有关分子常数和德哈姆展开式,标识了其中三条谱线,借助于电流时间衰减曲线,测量得出上述三条谱线对应的振动能级的动力学参数。  相似文献   

6.
丁广良  刘炳模  王嘉珉  龚顺生 《物理学报》1994,43(11):1754-1758
报道Cs原子里德伯态Stark能级场电离阈值与|ml|依赖关系的实验研究结果,从实验上同时测得Cs原子|ml|=0,1,2三种态的电离阈值表达式。 关键词:  相似文献   

7.
使用离子速度成像(Ion Imaging-Velocity Mapping)技术来测量光电子能谱及其角分布,对碘原子在277nm附近的(2+1)多光子电离过程I^*(^2P1/2)→I′(^1D2)6p[1]1/2→I^+和I(2P3/2)→I′(^3P0)6p[1]1/2→I^+进行了研究。与文献报道的结果相比,分辨率要好5倍,相对能量分辨率达到6%。还讨论了速度成像方法中速度分布校正和重构三维  相似文献   

8.
采用傅里叶变换光谱技术(FTS)记录了CH^35Cl3和它的同位素分子CH^35Cl2^37Cl的V=3的高分辨光谱,由于0.02m^-1分经不足以分辨K结构,我们将所观察到的谱线近似归属为K=0的转动能级,归属了CH^35Cl3岔子4〈J〈73,CH^35Cl^37Cl分子6〈J〈53的转动级。最后采用最小二乘法拟合,得到了关于J的转动常数和振动带心。  相似文献   

9.
郭文跃  方黎 《光学学报》1998,18(5):19-526
用多光子电离飞行时间质谱法三光子与丙酮分子3d形态和4s态共振的激光波长区域获得了丙酮分子的共振多光子电离分质量多光子电离(MPI)光谱和飞行时间质谱,实验观察到的主要产物是CH3CO^+和CH^+3,还观察到了少量的C^+,CH^+,CH^+2和CHO^+,在实验的激光波长范围内未见到母体离子,分质量多光子电离光谱具有相似的光谱结构,几个主要谐峰分别对应着(n0,3d)和(n0,4s)里德堡跃迁  相似文献   

10.
在465-485nm波长范围通过分质量激发谱研究了CS^+2的共振多光子解离。结果表明:在光子能量接近2.6eV及以上时,CS^+2R ^2π←X^2πg跃迁导致的1+1或1+2共振多光子解离分别产生碎片离子CS^2+和S^+而在更低的光子能量下CS^+2经由直接的2或3光子解离产生碎片离子CS^+S^+。  相似文献   

11.
邱济真  梅式民 《光学学报》1990,10(10):17-921
用多步激发的方法,将Sr原子从基态5s~2经价态4α~(-2)激发至(4d_(3/2)np,n_f)J=1和(4d_(5/2)np,nf)J=1自电离系列,观察其在外电场0~5kV/cm内的光谱.对所观察到的n=12,13,14附近的斯塔克谱图进行了分析与讨论.  相似文献   

12.
The Stark effect has been measured on four lines in the crystal spectrum of KCrO3Cl. The two lines found at 5476 Å and 5379 Å represent 0-0 transitions to a split 1 E(C 3n ) state. From the directions of the permanent dipoles in the two excited states it is concluded that both states are distorted relative to the ground-state geometry. No indication of a resonance interaction in the unit cell was found.  相似文献   

13.
The pure rotational transitions of HCO+ in excited vibrational states located below 5000 cm−1 over the ground state have been investigated with a high-sensitivity frequency/magnetic field double modulation submillimeter-wave spectrometer in the frequency range of 280-810 GHz. The ions were generated in an extended negative glow discharge through a gas mixture of a few millitorrs of H2 and CO and 12 mTorr of Ar buffer gas. Throughout the experiments, the cell was maintained at liquid nitrogen temperature. In the present study, we have determined accurate molecular constants for the excited vibrational states. Our analysis suggests that there may be a higher order Coriolis interaction between the (0 3 1) and (1 2 0) states. In previous investigations, the Stark effect caused by the electric field present in the discharge plasma was cited as a reason for non-observations of low-J lines in the (0220) and for the systematic shifts observed for low-J lines in the (0110), (0220), (0310), and (0420) states of HCO+ as well as DCO+. In the present investigation, some low-J lines in the (0220) and (0420) states have been observed in emission. Furthermore, J = 8-7, J = 9-8 lines in (031e1) were detected in emission. This finding indicates that missing low-J lines for the Δ sublevel obtained in the past is not due to the Stark effect but due to small population differences in those levels.  相似文献   

14.
An extensive theoretical and experimental analysis of the absorption and emission spectrum of a CH3OH FIR-laser excited by a conventional CO2 laser is presented. Particular interest is devoted to the Stark shifts of the pump and lasing lines and to the electric field dependence of the Fir-laser output of the various lines. The offsets with respect to the exciting radiation and the Stark shifts of the IR absorption (pump) lines are measured by means of the transferred Lamb dip technique. The theoretical behaviours of the Stark patterns are calculated for several choices of the quantum numbers and selection rules involved in the transitions. A large variety of experimental results are reported and compared to theory. Non-linear Stark shifts have been observed for the 37.5m FIR laser line and for the IR-pump transitions excited by the 9-P(38) and 10-R(38) CO2 laser Lines. Line assignments are proposed and new FIR laser lines are reported.  相似文献   

15.
徐家坤  陈海清  刘红平 《中国物理 B》2013,22(1):13204-013204
We calculate the diamagnetic spectrum of lithium at highly excited states up to the positive energy range using the exact quantum defect theory approach. The concerned excitation is one-photon transition from the ground state 2s to the highly excited states np with π and σ polarizations respectively. Lithium has a small quantum defect value 0.05 for the np states, and its diamagnetic spectrum is very similar to that of hydrogen in the energy range approaching the ionization limit. However, a careful calculation shows that the spectrum has a significant discrepancy with that of hydrogen when the energy is lower than 70cm-1 . The effect of the quantum defect is also discussed for the Stark spectrum. It is found that the σ transition to the np states in an electric field has a similar behavior to that of hydrogen due to zero interaction with channel ns.  相似文献   

16.
The resonance-enhanced multiphoton ionization (REMPI) spectra of atomic chlorine and bromine in the range of 230-245 nm and 250-285 nm were obtained by using REMPI and time of flight (TOF) techniques. There are twenty -six lines for Cl and twenty-three for Br in the spectra, among which five transitions of Cl and four of Br are observed for the first time. These lines are due to transitions from the Cl(3p 2P03/2, 2P01/2) and Br(4p2P03/2, 2P01/2) states to upper states induced by two-photon excitation. It is found that the Stark shift of different excited states are almost the same, and they are independent of the S, L, and J quantum numbers of the excited state.  相似文献   

17.
The spectrum of cyanoformamide, NCCONH2, has been measured between 18 and 40 GHz using a Hewlett-Packard spectrometer with Stark modulation. The molecule is somewhat unstable and could most conveniently be measured in a flow system. The quadrupole hyperfine structure due to the two nitrogen nuclei has been analyzed for the ground state, and quadrupole coupling constants, rotational constants, and centrifugal distortion constants have been determined for the ground state. A rough determination of the components of the electric dipole moment was possible from the Stark shifts of suitable transitions.  相似文献   

18.
Previous work involving the rotational spectrum of 2-aminopyridine was limited to the lower frequencies of 4-40 GHz with very few lines being assigned. This work extends this earlier study. Here we present a much more extensive measurement and assignment of the rotational spectrum of 2-aminopyridine in the frequency range of 75-110 GHz. The observed frequencies have been assigned to the ground (0+ state) and the first excited state in the inversion vibration (0 state). Measurements of these two states have been extended up to J=46. With the newly assigned lines, significantly improved rotational constants and all five centrifugal distortion constants have been obtained.  相似文献   

19.
We investigate the effect of a static electric field on photoionization of the He atom in the ground 1S and low-lying 2S and 2P excited states. The field-affected ionization potential and photoionization cross-section are determined from the complex eigenvalues of the time-dependent Schr?dinger equation solved by the complex rotation method in the Floquet ansatz. Accuracy of the method is enhanced by the use of the Hylleraas basis set. For the ground state of helium, we find that the total photoionization cross-section remains constant or decreases as a function of the DC field strength until this field reaches a certain critical value. For the low-lying excited states, effect of the static field is similar to the ordinary DC Stark effect.  相似文献   

20.
Two-photon induced stimulated Raman scattering has been observed for the first time. The observations have been made in cesium vapor. In the process cesium atoms are excited from the 6S32 ground state to the 6P32 excited state through the absorption of two laser photons at 1.064 μm and the emission of one scattered photon at 1.416 μm. The spectrum of the scattered light reveals the optical Stark shifts of the initial and final levels.  相似文献   

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