THE MID-INFRARED FREQUENCY STANDARD USING 14NmO(m=16,17,18) SPECTRAL LINES

Based on the global analysis of all available and reliable data for isotopic species ¹⁴N^mO(m=16,17,18), the ¹⁴N¹⁶O rovibrational spectral lines are calculated with very high accuracy and completely agree with previous results. These lines with relative intensities can be achieved as an infrared frequency standard in the spectral range 1600-5600 cm^-1. The calculated rovibrational transitions of ¹⁴N^mO(m=17,18) have the same accuracy as that for ¹⁴N¹⁶O although their data are rare due to their small natural abundance.     

CO LMR spectrum of ~(14)N~(16)O and its analysis with spectra of ~(14)N~(17)O and ~(14)N~(18)O

LMR spectra for v=1←0 transitions of 14N16O in X2Π1/2,3/2 states were observed at 5.6 μm and 5.4 μm of CO laser. Introducing the advanced isotopic molecular constant scaling function to Hund's case (a) diatomic structure model, these spectra were analyzed and fitted together with all reliable previous spectral data of 14N16O as well as 14N17O and 14N18O. A full set of precise molecular parameters and their vibrational dependencies have been determined with much higher precision (1 -2 orders for most parameters). Many of them have been obtained for the first time. Using isotopic scaling function, the molecular constants of 14N17O and 14N18O were deduced.     

飞秒泵浦-探测质谱方法研究苯内转换动力学

以飞秒 40 0及 2 66nm激光脉冲结合泵浦 探测飞行时间质谱方法研究了苯S2 态内转换动力学 .40 0nm双光子过程将苯分子激发到S2 电子态 ,布居在S2 电子态的分子由于能级耦合无辐射弛豫到S1电子态 .通过测定C6 H6 +讯号强度随泵浦 探测延迟时间的改变 ,获得苯S2 及S1电子态的衰减寿命分别为 ( 48± 1)fs及 ( 6.5± 0 .2 )ps ,S2 态及S1电子态的消激发机理被认为是相应势能面间的锥形交叉引起的内转换     

飞秒泵浦-探测实验数据分析

陈述了几种获取飞秒泵浦 探测实验数据中的光解动力学信息的解析物理模型 .其中单分量和双分量模型用来解释母体分子的单通道和双通道解离过程 ,另一个单分量模型用来解释碎片分子的解离或去激发过程 .所有模型都结合泵浦 探测实验数据予以解释     

Stability of Complex-Rotation Method on a Simple Resonant Scattering Problem

The stability of the complex-rotation method in B-spline basis for a simple atomic resonant scattering problem in free field is investigated. The numerical calculation shows that this method has a feature that the solution will not change in a wide range of rotation angle θ. Our determined scattering resonant energies and widths exactly coincide with the popularly accepted values. A new resonance is identified numerically although it is very broad. The norm of the complex eigenvalue, ｜E｜, is proposed to investigate and to evaluate the stability of the obtained complex eigenvalues.     

Scaled-energy spectroscopy of a ｜M｜= 1 Rydberg barium atom in an electric field

We observe strong energy-dependent quantum defects in the scaled-energy Stark spectra for |M| = 1 Rydberg states of barium atoms at three scaled energies: ε = 2.000,ε = 2.500 and ε = 3.000.In an attempt to explain the observations,theoretical calculations of closed orbit theory based on a model potential including core effect are performed for non-hydrogenic atoms.While such a potential has been uniformly successful for alkali atoms with a single valence electron,it fails to match experimental results for barium atoms in the 6snp Rydberg states with two valence electrons.Our study points out that this discrepancy is due to the strong perturbation from the 5d8p state,which voids the simple approximation for constant quantum defects of principle quantum number n.     

Laser frequency offset-locking using electromagnetically induced transparency spectroscopy of ~(85)Rb in magnetic field

We have experimentally offset-locked the frequencies of two lasers using electromagnetically induced transparency(EIT) spectroscopy of ~(85)Rb vapor with a buffer gas in a magnetic field at room temperature. The magnetic field is generated by a permanent magnet mounted on a translation stage and its field magnitude can be varied by adjusting the distance between the magnet and Rb cell, which maps the laser locking frequency to the space position of the magnet. This frequency-space mapping technique provides an unambiguous daily laser frequency detuning operation with high accuracy.A repeatability of less than 0.5 MHz is achieved with the locking frequency detuned up to 184 MHz when the magnetic field varies from 0 up to 80 G.     

Experimental investigation of barium spectra in crossed electric and magnetic fields

This paper has studied the barium spectra in external magnetic and electric fields on the recently-built system based on a super-conducting solenoid with high stability of better than 1 Gauss. Firstly, we compared the spectra in a high pure magnetic field of $B=4.00000$\,T for different polarized laser, $\sigma^{+}$ and $\sigma^-$. We prove that after a proper shift, the $\sigma^+$ and $\sigma^-$ spectra are completely identical. We also investigated the dependence of the spectral feature in the high magnetic field on an additionally applied crossing electric field. Along with the increase of the electric field, there is an energy shift for every spectral line. Based on a transformative Hamiltonian, we explained this energy shift well.     

非对称陀螺自由基分子光谱的标识分析

系统阐述了非对称陀螺分子光谱的标识分析工作涉及的一些关键理论问题,包括有效Hamilton量、表象和基矢、能级识别、跃迁选择规则、相对强度和Zeeman调制率等,并在有效Hamilton量中引入高阶离心畸变项,大大提高了计算精度,并使高转动量子数跃迁的标识分析成为可能.作为应用实例,对14N16O2基振动态的零场和磁共振谱进行了统一分析(globalanalysis),获得了迄今为止最精确、最完整的14N16O2基振动态分子结构参数,并对Curl和Brown等人过去未能标识的14N16O2高转动量子数跃迁远红外激光磁共振谱线进行了成功标识.     

非对称陀螺自由基分子光谱的标识分析——NO2基振动态纯转动光谱分析

系统阐述了非对称陀螺分子光谱的标识分析工作涉及的一些关键理论问题,包括有效Hamilton量、表象和基矢、能级识别、跃迁选择规则、相对强度和Zeeman调制率等,并在有效Hamilton量中引入高阶离心畸变项,大大提高了计算精度,并使高转动量子数跃迁的标识分析成为可能.作为应用实例,对¹⁴N¹⁶O₂基振动态的零场和磁共振谱进行了统一分析(global analysis),获得了迄今为止最精确、最完整的¹⁴N¹⁶O₂基振动态分子结构参数,并对Curl和Brown等人过去未能标识的¹⁴N¹⁶O₂高转动量子数跃迁远红外激光磁共振谱线进行了成功标识.