非对称陀螺自由基分子光谱的标识分析──NO_2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.     

基于LabVIEW的超声分子束激光光谱仪控制系统设计

文章阐述了超声分子束激光光谱仪的结构特点,介绍了在LabVIEW平台上结合RS-232接口和PXI总线技术进行仪器控制和数据采集的设计方法.在现有实验环境下,开发了基于LabVIEW的超声分子束激光光谱仪控制系统,实现了设备控制和光谱数据采集软件自动化.     

金华—义乌都市区信息资源整合与联动发展研究

介绍金华一义乌都市区经济社会发展和信息资源集群组织与区域分布的基本情况及特征,从信息资源规划、信息资源共享的内容与范围及模式的选择、信息资源空间布局等方面.论述了信息资源整合与联动对金义都市区的经济与社会发展产生的积极作用.     

最短网络

§1.楔子假设电话刚被发明,邮电部的第一个任务是要使北京、上海、兰州三个城市间有线路相通。你是总工程师,如何设计路线呢?第一个考虑是希望线路愈短愈好,以节省铺设电话线所需的材料、人工及土地。你知道两点间最短的距离是直线,所以电话线路原则上应该都是直线。你也想到了兰州到上海是这三条路线里最长的一条,但是如果有了另外那两条,这一     

Extended Measurement of the v2 (1- ←0+) Band of H3O+ by Mid-Infrared Diode Laser Spectroscopy

Twenty-five new R-branch lines of the v2（1^-← 0^＋） band of H3O^＋ are measured using diode laser velocity modulation spectroscopy between 1070 and 1230 cm^-1. The H3O^＋ ions are produced in a high voltage ac discharge with water diluted in helium. The observed lines together with all the previously published measurements are fit to the standard vibration-rotational Hamiltonian of an oblate symmetric top, yielding a set of improved molecular constants. All the sextic centrifugal distortion constants for both 0^＋ and 1^- states are determined precisely. The observed R（13, 0） transition is shifted about -0.129 cm^-1 from its calculated value, indicating that a near degeneracy exists between the （13, 0）^＋ and （13, 3）^- ground-state rotation-inversion levels.     

一种新型音频辉光放电高压电源

研制出一种多用途、宽频带的音频辉光放电高压电源，工作频率为10～130kHz，输出电压连续可调，并成功地应用到速度、浓度调制等激光光谱实验中。     

Spectroscopic analysis of asymmetric top free radicals——Application to pure rotational spectra of NO_2 in the ground vibronic state

Several key problems involved in the analyses of spectra of asymmetric top molecules, i.e., the effective Hamiltonian, the representation and basis vector, identification of energy levels, the selection rules, the relative intensity, and Zeeman tuning rate, were elucidated systematically. Introducing the high-order centrifugal distortion terms into the effective Hamiltonian, the precision for calculation has been improved substantially, which allows us to analyze the high-lying rotational transitions. A global analysis of all available spectra of 14N16O2 in the ground vibronic state has been made to obtain a set of molecular constants of 14N16O2 in the ground vibronic state which is the most precise and extensive so far. Using the improved parameters, some FIR LMR lines left unassigned hitherto have been identified successfully.     

Analysis of far-infrared laser magnetic resonance spectra of CH2Br at 447.3 and 671.1μm

A simple model has been developed to describe the Zeeman patterns of far-infrared laser magnetic resonance spectra of the monobromomethyl radical CH₂Br observed at 447.3 and 671.1μm. A satisfactory agreement between the experimental spectra of the radical and their simulation with this simple model has been achieved. This approach can be used to gain further information about the structure and the spectrum of this interesting radical.