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基于激光诱导击穿光谱技术, 利用Nd:YAG脉冲激光激发Al2O3 (含量为99%)陶瓷片产生等离子体, 获得了AlO自由基B2∑+–X2∑+跃迁的33条发射谱线. 就AlO自由基光谱的时间演化规律和激光能量对谱线的影响规律进行了研究与分析. 结果表明, AlO自由基光谱出现在Al原子和Al离子光谱之后, 且持续时间较长. 当激光的脉冲能量由10 mJ起不断增加时, AlO自由基光谱强度逐渐减小, 且最大值出现时间随激光能量的增加而后移. 在此基础上, 进行了陶瓷等离子体在空气和氩气环境下的对比试验, 发现从Al2O3陶瓷片中激发所产生的AlO自由基必须有空气中O2参与反应.
关键词:
激光诱导击穿光谱
AlO自由基
B2∑+–X2∑+跃迁光谱')" href="#">B2∑+–X2∑+跃迁光谱 相似文献
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制备了Yb3+掺杂四磷酸盐玻璃,以实测的吸收光谱及荧光光谱计算了Yb3+在四磷酸盐玻璃中各光谱性能参数和激光性能参数,以荧光捕获效应讨论了倒易法和Fuchtbaucr-Ladenbury公式之间的计算差异.此外,还进一步讨论了Yb3+在四磷酸盐玻璃中各性能参数的浓度效应以及OH基对Yb3+发光的影响.研究表明Yb3+掺杂四磷酸盐玻璃具有相当优良的光谱和激光性能参数.
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3+掺杂')" href="#">Yb3+掺杂
四磷酸盐玻璃
光谱性质 相似文献
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通过对速度调制分子离子激光光谱技术中光谱信号的强度及线宽的测量,获得了辉光放电中等离子体的电子浓度、电子温度及德拜长度等主要参数。 相似文献
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Directional correlation measurements (e-e, e-γ) have been performed on 182W. The multipole mixing ratios have been measured for the 2γ+2?2g+0 and 4γ+2?4g+0 transitions and a 6+6-6g+0 transition in the decay of 182Ta and 182Re. The mixing ratio of the 2β+0-2g+0 transition is discussed. A strong mixing of the 4β+ and 4γ+ states is suggested. 相似文献
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H. Kusakari N. Yoshikawa H. Kawakami M. Ishihara Y. Shida M. Sakai 《Nuclear Physics A》1975,242(1):13-29
Low-lying excited states of 124,126Xe and 132Ba have been studied by means of in-beam γ-ray spectroscopy in (p, xny) reactions. Excitation functions, angular distributions and γ-γ coincidence spectra were obtained. The 22+ , 3+, 42+ and 5+ levels were observed at the following excitation energies in keV: 846.4(22+), 1247.5(3+), 1437.3 (42+), 1836.6(5+) in 124Xe, 879.7(22+), 1317.3(3 +), 1488.2(42+), 1903.1(5 +) in 126Xe and 1032.1(22+), 1511.3(3+), 1729.9(42+) in 132Ba. The 2214.3 and 2561.7 keV levels in 126Xe were tentatively assigned as the 62+ and 7+ levels, respectively. These 22+, 3 +, 42+, 5+, 62+and 7+ levels are interpreted as members of a quasi-γ band. The E2/M1 mixing ratios of the 22+ → 21+ transitions in 124,126Xe and 132Ba were obtained as + 6.3+5.3?2.0 + 10.87.8?3.2 and + 8.3+4.9?2.2, respectively. 相似文献
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The room-temperature luminescent emission characteristics of Sr2CeO4:M+ and Sr2CeO4:Eu3+,M+ (M+ = Li+, Na+, K+) have been investigated under UV excitation. By introducing appropriate alkali metal cations dopants (Li+, Na+, K+) into the crystalline lattice, not only emission color of the blue-white-emitting Sr2CeO4 doped with low Eu3+ content can be tuned to green, but also the red emission intensity of Sr2CeO4 doped with high Eu3+ concentration is strengthened significantly. The relevant mechanisms have been elucidated in detail. 相似文献
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Lei Gong Fuyi Liu Liusi Sheng Zhenya Wang 《Journal of Electron Spectroscopy and Related Phenomena》2010,182(3):134-140
The dissociative photoionization mechanism of l-menthone has been investigated with photoionization mass spectrometry using synchrotron radiation. The adiabatic ionization energy (IE) of l-menthone and the appearance energies (AE) of its major fragment ions C9H15O+, C9H17+, C8H16+, C7H11O+, C6H10O+, C6H9O+, C5H8O+, C5H10+, C4H6O+, C5H9+, C4H8+, C4H7+, C3H7+, C3H6+, C2H2O+, and CH3+ are determined with their photoionization efficiency (PIE) spectra in the photon energy region of ∼8−15.5 eV. Breakdown diagrams identifying the major products are presented. Dissociative photoionization channels for formation of these fragment ions are proposed based on comparison of determined experimental appearance energies and energies predicted with the DFT calculations. According to our results, the experimental dissociation energies are in fair agreement with the theoretical values of the possible photodissociation channels of C10H18O. 相似文献
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Electron stimulated desorption of H+, CH3+, H2+ and D+ has been measured as a function of excitation energy for condensed phase neopentane, tetramethylsilane, 2-methylpropane-1-d1, and 2-methylpropane-2-d1. The data show that the processes which result in both H+ and CH3+ production are initiated by the same excitation. The excitations which produce H+, CH3+ and H2+ appear to be largely localized on the methyl groups. The results indicate that multi-electron (hole) final states are responsible for H+ and CH3+ desorption. 相似文献
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Studies of the time dependencies of the number density of N 2 + , Ne+ and Ne 2 + ions have been made during the decay period of plasmas produced in neon containing various concentrations of nitrogen molecules. Reaction rate constants were obtained for N 2 + +N2+Ne→N 4 + +Ne((1.2±0.2)×10?29 cm6 sec?1) and Ne++N2→N 2 + + Ne ((2.9±0.3) × 10?12 cm3 sec?1). The ambipolar diffusion coefficient of N 2 + in neon was found to beD a p o =350±20 cm2 sec?1 Torr. 相似文献
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ABSTRACTInteractions of cycloheptatriene derivatives, C7H6X, (X?=?NH, PH, AsH, O, S, Se) with the cations H+, CH3+, Cu+, Al+, Li+, Na+, and K+ are studied using B3LYP functional and 6-311++G(d,p) basis set. The calculated gas-phase cation affinities (CA) and cation basicities (CB) for all molecules decrease as H+ > CH3+ > Cu+ > Al+ > Li+ > Na+ > K+. We used the induced aromaticity in the 7-membered ring of C7H6X upon interaction with the cations, M+, as a measure of C7H6X/M+ interaction. Nucleus-independent chemical shift (NICS) and harmonic oscillator model of aromaticity (HOMA) were used as two indices of aromaticity. The highest and lowest induced aromaticities were observed for interactions of H+ and K+, respectively. Also, the aromaticity induced by interaction with a cation in C7H6AsH and C7H6PH was larger than that in C7H6NH and C7H6O. Hence, the aromaticity was considered as a measure of covalency for the C7H6X/M+ interactions showing a rational dependence on both the molecule and cation. The nature of the interactions was also assessed using electron density, charge distribution analysis and NBO calculations. The results of the aromaticity indices, NICS and HOMA, were compared with the electron density and NBO results. 相似文献
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The equilibrium geometries, nuclear distances, wave functions and energies for the XY 2+ , X2Y+, Y2H+ (X=Li, Na, K; Y=Rb, Cs), resp. the X2H+, X2Y+ (X, Y=Cu, Ag, Au) triatomic alkali ions, resp. noble metal ions, further the dissociation energies for the X2Y+→X++XY; XY 2+ →Y++XY and Y2H+→Y++YH processes are determined with the pseudopotential method. The calculations were performed using the Hellmann-type analytical potential with simple floating-type one-centre wave function.
相似文献20.
A new analytical potential energy function for diatomic molecular ion XY+ is proposed based on the energy consistent method (ECM). The Coulomb potential included in the new ionic potential contains
multipole corrections, converges quickly and is variationally, changeable. The new potential and the ECM are applied to variationally
studying the potential energies of eight electronic states of several diatomic molecular ions: the A2π state of CO+, the X2∑g+ state of Li2+, the X2∑g+ state of He2+, the 12∏u state of Na2+, the A2∏u state of N2+, the X1∑+ state of KrH+, the X2∑+ state of SiO+ and the A2π state of SO+ ion. The present results agree excellently with the experiment-based Rydberg-Klein-Rees (RKR) potentials, and are superior
to the commonly used Huxley-Murrell-Sorbie (HMS) analytical potentials, and are better in some cases than some quantum mechanicalab initio potentials in the ionic asymptotic and dissociation regions. 相似文献