运用光电流光谱测定钬原子能级的超精细结构

用自制钬空心阴极灯,运用光电流光谱技术在569nm～600nm谱区内首次测定了元素钬的9条谱线,确定其相应跃迁能级,及超精细结构常数.     

用荧光法在空心阴极灯中测定镨原子的超精细结构谱

本工作在自制的Pr-Kr空心阴极灯中,用荧光法测量了6603.60cm~(-1)～23488.64cm~(-1),9684.24cm~(-1)～26654.48cm~(-1)及9641.90cm~(-1)～26654.48cm~(-1)能极间跃迁所相应的超精细结构谱.计算了23488.64cm~(-1)及26654.68cm~(-1)能级的超精细结构常数A.这是镨原子用荧光法在空心阴极灯中测定超精细结构谱的首次报道.     

空心阴极灯中镧原子消多普勒光谱

我们在自制的La-Kr阴极灯中,用内调制、消多普勒荧光法研究了镧原子一些能级的超精细结构.据我们所知,其中20197.34cm~(-1)、21447.86cm~(-1)能级的超精细结构常数A、B尚无报道,这还是第一次.此外,还获得了线宽小于40MHz的线型和来自公共低能级的所有交岔线(Cross-Over line).对阴极灯中原子光谱特性进行了研究.     

^139LaⅠ超精细结构光谱测量

本文用激光光电流光谱方法研究了~(139)LaI五个奇宇称能级的超精细结构,其中三个是首次报道.采用最小二乘拟合,得到了这些能级的磁偶极超精细结构常数A.     

阴极灯中镧的Doppler—Limited光谱

我们在自制的La-Kr阴极灯中,利用激光诱导荧光法,在罗丹明6G和DCM染料波长范围内,对镧的超精细结构进行了较详细研究。其中关于能级19129.3、15196.8、18172.4、18603.92、22439.4cm~(-1)的超精细结构常数A的报道,据我们所知还是第一次。     

钯原子谱线的分支比测量

运用钯元素空心阴极灯和高分辨率光栅单色仪测量了钯原子4d⁹6s和4d⁹5d组态的7个偶宇称能级的发射光谱,确定了这些能级向4d⁹5p组态能级跃迁产生的15条谱线的跃迁分支比.本文大部分结果是对文献中钯元素原子相关光谱参数的重要修正. 关键词： 原子光谱 钯原子 分支比 空心阴极灯     

荧光法测定镧原子高激发态的超精细结构

在Ｌａ空心阴极灯中，用荧光法测定了二级跃迁（１６８５６ｃｍ＾－１→３４２７２ｃｍ＾－１），（２００８２ｃｍ＾－１→２６８５３ｃｍ＾－１）和（２００８２ｃｍ＾－１→３７５４４ｃｍ＾－１）的超精细结构光谱，得到了３４２７２ｃｍ＾－１，３６８５３ｃｍ＾－１和３７５４４ｃｍ＾－１能级的Ａ常数，这些镧原子高激发态超精细结构数据是首次报道。     

141Pr+波长56908 nm谱线超精细结构测量

利用共线快离子束-激光高分辨光谱学测量了141Pr+波长为56908nm谱线的超精细结构光谱，由此得到超精细相互作用常数和参与跃迁激发态、亚稳态能级的超精细能级分裂-与已有的数据比较，在实验误差范围内一致，但测量精度提高了一个数量级- 关键词： 超精细结构 快离子束-激光光谱学 磁偶极矩和电四极矩超精细作用常数     

类氧铥离子辐射跃迁几率和激发态寿命的GRASP计算

使用扩展的相对论多组态自洽场方法计算了类氧铥离子的精细结构能级，跃迁波长，自发辐射跃迁几率，受激辐射跃迁几率，振子强度和激发态寿命。从计算结果发现：在３ｐ－３ｓ跃迁中有４个跃迁很有可能实现粒子数反转而辐射激光。     

143,145Nd+ 570.38 nm谱线的超精细结构作用常数测量

利用共线快离子束－激光高分辨光谱学方法测量了^143,145Nd^ 570.38nm谱线的超精细结构光谱，并得到了参与跃迁的上、下能级的超精细相互作用常数。     

~(141)Pr~ 581.69nm谱线超精细结构光谱研究

利用共线快离子束 激光光谱学方法测量了正一价镨离子波长 5 81.6 9nm谱线的超精细结构光谱 ,得到了超精细相互作用常数 ;与已发表的数据比较 ,在测量误差范围内一致 ,我们的测量精度提高了一个量级     

利用三能级光谱技术研究^235U的高激发态,超精细结构

本文报道用两台连续激光级联共振的方法,测量了(255)~U的→16900→33625cm~(-1)跃迁的超精细光谱结构,给出了33625cm~(-1)能级的超精细结构常数A、B,从而给出一种测量难熔、有毒金属高激发态能级结构的简单且精确的方法.     

High-resolution LIF measurements on hyperfine structure and isotope shifts in various states of Lu I using the second and third harmonic of a cw Ti:sapphire laser

With the second and third harmonic of a tunable single-mode cw Ti:S laser, generated inside external enhancement cavities, high-resolution LIF measurements on several states of Lu I in various parts of the electromagnetic spectrum are performed. From these measurements, hyperfine structure A and B constants for both ¹⁷⁵Lu and ¹⁷⁶Lu as well as isotope shifts have been determined for all levels observed in the single-step excitation process. From the measured A constants, the magnetic hyperfine structure anomaly has been derived for various states. Received 14 January 2002 Published online 19 July 2002     

High resolution measurements of the hyperfine structure of atomic Lanthanum for energetically low lying levels of odd parity

Doppler-reduced saturation absorption spectroscopy is applied to study the hyperfine structure of excited levels of Lanthanum. 16 transitions in the near infrared wavelength range are investigated. Precise values for the magnetic dipole hyperfine structure constants A as well as for the electric quadrupole hyperfine structure constants B of the isotope ¹³⁹La are determined for 14 levels of odd parity and nine levels of even parity. For levels of even parity a good agreement is found with values from previous measurements using sub-Doppler methods. For levels of odd parity previously determined values are improved and for two levels new values of the hyperfine structure constants are reported.     

Measurements of hyperfine structure and shift for atomic uranium by laser induced-fluorescence spectroscopy

The paper reports that the isotope shift between natural uranium isotope 235and 238 and the hyperfine sturcture width width of U~(235) were measured by means of laser-in-duced fluorescence spectroscopy.The A and B hyperfine structure splitting constants of U~(235)were also given for 14643 cm~(-1),15720 cm~(-1)and 15631 cm~(-1) levels.     

Wigner crystals of 229Th for optical excitation of the nuclear isomer

We have produced laser-cooled Wigner crystals of 229Th3+ in a linear Paul trap. The magnetic dipole (A) and electric quadrupole (B) hyperfine constants for four low-lying electronic levels and the relative isotope shifts with respect to 232Th3+ for three low-lying optical transitions are measured. Using the hyperfine B constants in conjunction with prior atomic structure calculations, a new value of the spectroscopic nuclear electric quadrupole moment Q=3.11(16) eb is deduced. These results are a step towards optical excitation of the low-lying isomer level in the 229Th nucleus.     

Hyperfine structures in the configuration 4f5d6s of the praseodymium atom

Results of hyperfine structure studies of the praseodymium atom are presented. Hyperfine spectra were obtained by the method of laser induced fluorescence on an atomic beam. Values of the hyperfine structure constants of the lower levels belonging to the configuration 4f³5d6s and for the upper levels (usually unclassified) are presented.