共查询到18条相似文献,搜索用时 234 毫秒
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利用电热法将含金物质加热,产生Au原子束,再以两束UV脉冲激光垂直照射,将处于基态的Au原子共振激发至高Rydberg态。滞后于激光脉冲200ns的高压脉冲电场(6500V/cm)加到反应区,使处于Rydberg态的Au原子电离。激光波长在一定范围内扫描,共测出了Au原子的n2D3/2(n=18—38)和n2S1/2(n=21—34;36—38)两通道的38条能级的位置。用参数拟合得到2D3/2和2S1/2两系列的极限分别为:ED=74409.8(3)cm-1,ES=74410.0(2)cm-1,计算了每条能级的量子亏损。我们的实验还证明了场电离是一种十分有效的电离手段,比用通常的激光光电离效率要高得多。这在共振电离谱学(RIS)的研究中是一种很有效的方法。
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利用多通道量子数亏损理论对钾的一价离子的3p光吸收光谱进行了分析,计算并预言了80多个实验上未观察到的能级以及相应能级的朗德g因子,对于实验上未区分的能级做了重新的认定,预言了自电离区的3p5ns(1/2,1/2)n=17-21的能级,讨论了通道之间的干扰情况。 相似文献
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采用三台可调渚激光实施孤立实激发,分三步将处于基态的Ba原子激发到6P1/2nd(J=1,3)和6p3/2nd(J=1,3)自电离态上,获得了分别从6snd1D2(n=7-15)和6sad3D2(n=7-12)激发而得到的6p1/2nd(J=1,3)和6p3/2nd(J=1,3)自电离光谱,重点对主量子数n较低的自电离态进行了实验研究.通过光谱的线形拟合得到了上述能级的位置和宽度等数据,进而获得了量子弓损和约化宽度等信息.通过对不同系列的自电离光谱的分析和比较,详细讨论了这些自电离态的光谱特征及其复杂光谱结构的成因. 相似文献
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利用脉冲染料可调谐激光激发原子密度为10~(14)~10~(18)cm~(-3)的稠密碱金属钾蒸气,在5780(?)~5920(?)波段内测量了激光共振电离光谱.结果表明,除了钾原子4s—nd(n=10~16)、4s—ns(n=12~18)双光子跃迁以外,还出现了钾4P—7s、4P—5d跃迁.这种跃迁的电离光谱信号是由于在钾蒸气中钾分子-原子混合双光子跃迁而产生的.本文对钾蒸气混合双光子跃迁进行了讨论. 相似文献
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利用多通道量子亏损理论(MQDT),结合已知的K矩阵,研究了受实验条件限制目前无法得到的Mg原子3p3/2nd(J=1,3)系列的自电离分支比,同时对3pnd系列的部分自电离光谱作了计算,并取得了和实验比较吻合的结果。结合分支比研究结果探讨了Mg原子的能级结构特点及粒子数反转的可能性 相似文献
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Jung-Bae Kim Kawamura K. Young Wook Choi Bowden M.D. Muraoka K. Helbig V. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1998,26(5):1556-1561
A method for electric field measurement based on laser spectroscopy of argon atoms has been developed and calibrated. Measurements were made using both laser optogalvanic spectroscopy and laser-induced fluorescence spectroscopy. Measurements using several different transitions in argon were carried out, and it was found that the 4s→7f and 4s→8f transitions were the most suitable for measurements in the sheath region of glow discharges. The lower limit for electric field measurements was estimated to be 500 V/cm. A minimal pressure of about 100 mtorr was required to detect optogalvanic signals and about 1 torr was required for the fluorescence signals to be detectable. These detection limits make this method applicable for measurement of sheath electric fields for a wide range of discharge conditions 相似文献
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Considering the perturbation, the results of theoretical calculation of five Rydberg series energy levels 6s2ns^2S1/2 (n = 7 - 20), 6s^2nd^2D3/2 (n = 6 - 20), 6s^2nd^2D5/2 (n = 6 - 20), 6s^2np^2P1/2^0 (n = 7- 20), and 6s^2np^2P3/2^0 (n = 7-20) for Tl I are presented using the weakest bound electron potential model (WBEPM) theory. Furthermore, the radiative lifetimes of this five series are also calculated. The calculated values of energy levels and lifetimes are in good agreement with the experimental results. 相似文献
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The performance of a narrow-linewidth nanosecond pulsed deep-UV coherent light source consisting of a frequency-tripled nanosecond pulsed Ti:sapphire laser injection seeded by a frequency-scanning cw Ti:sapphire laser has been characterized by using optogalvanic spectroscopy of silicon atoms as a diagnostic. The envelope of the optogalvanic spectrum indicates the pure Doppler broadening of silicon atoms, which was estimated to be as broad as 4 GHz, without the broadening effect from the laser linewidth itself. 相似文献
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We demonstrate coherent optical detection of highly excited Rydberg states (up to n=124) using electromagnetically induced transparency (EIT), providing a direct nondestructive probe of Rydberg energy levels. We show that the EIT spectra allow direct optical detection of electric field transients in the gas phase, and we extend measurements of the fine structure splitting of the nd series up to n=96. Coherent coupling of Rydberg states via EIT could also be used for cross-phase modulation and photon entanglement. 相似文献
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用分步激发方法及偏振光技术,测定了锶的(5p3/2ns)1(n=13-21)及(5p3/2 nd)3(n=13-24)各自电离谱,在低于5p1/2电离限的(5p3/2ns)1态的实电子激发谱中,出现对应于(5p1/2ns)1及(5p1/2nd)1的畸变峰,畸变峰也出现于(5p3/2nd)3的实电子激发谱中。这说明(5pjns)(5pjnd)自电离系列间存在相互作用。
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用可调谐激光两步激发Na原子高激发发里德堡态布居,在光激发后施加脉冲电场测量激发态的场电离阈,利用阈值电场和延迟场电离方法测定了ns(n=20~24)和nd(n=19~23)态的寿命值,并与计算值进行了比较,对影响寿命的因素作了讨论。 相似文献
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Raman光谱分析脉冲电场对大豆分离蛋白的影响 总被引:1,自引:0,他引:1
采用自行研制的高强脉冲电场设备,利用拉曼光谱分析脉冲电场对大豆分离蛋白微观结构的影响。结果表明,在50 kV.cm-1的高强脉冲场强下,PEF诱导2 886 cm-1附近峰明显消失,脂肪族侧链C—H伸缩振动微环境极性和色氨酸残基微环境极性不断增强;诱使C—H平面弯曲振动、C—N伸缩振动,以及天冬氨酸和谷氨酸中的C O伸缩振动减弱;诱导酰胺键C O伸缩振动和N—H摇摆振动增强。同时发现酪氨酸被包埋程度随着脉冲时间的延长而先增加后减小,在脉冲处理时间为1 600μs时,酪氨酸包埋程度最大。 相似文献