共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
CH自由基在燃烧化学、星际化学、化学发光和化学激光研究中占有重要的地位,并且作为最简单的碳氢化合物,CH自由基是理想的理论计算模型分子,在理论研究领域中也有着重要的地位.因此 ,多年来人们对CH自由基进行了大量的研究[1 -9],但是对于CH自由基,到目前为止大部分局限于低激发态的研究,对于较高激发态的研究报导则很少见.Chupka等[2 -6]用(2 1)REMPI方法获得了CHD态的v=2振动能级光谱.然而后来Tjossem和Smyth[7]测量了同波段的REMPI光谱,发现他们测得的光谱谱峰强度与… 相似文献
7.
测定了卤化氢(HCl, HBr 和HI) (2+1)共振增强多光子电离(REMPI)光谱, 采用模拟计算法分析推导出转动常数、谱带源以及Ω态振动谱带的同位素位移值. 得到的HCl数据同Green等人用常规分析法所推导的结果极为吻合. 得出8条振动谱带,其中包括V(1∑+)态, E(1∑+)的v'=4态以及HBr的5个新谱带, 此外还推导出HI的E态v'=1的4个振动谱带光谱参数. 观测了V和E态之间因同类相互作用而产生的不规则能级间距、转动参数和同位素位移. 讨论了HCl和HBr的E态和V态振动谱带中的转动谱线序列O和S对Q的强度比变化,提出了双光子激发机理. 相似文献
8.
9.
利用Ar/CF4、Ar/CF2Cl2或Ar/CF3COOH混合气体的直流脉冲放电产生CF自由基,观测了260~360nm范围内转动分辨的CF自由基双光子共振增强多光子电离谱。分析表明,该段光 谱对应于CF自由基3pπD2Πr(ν'=2~6,r=3/2,1/2)←←X2Πr(ν"=0,r=3/2,1/2)的共振激发。对观测的振动带进行了转动分析,并获得了3p里德堡态的转动常数和自旋-轨道分裂值。 相似文献
10.
Multiphoton dissociation-ionization dynamics of Fe(CO)_5 were studied mass spectrometrically with a molecular beam and XeCl excimer laser. The results show that Fe(CO)_n~+ (n= 1,2,… ,5) and Fe_2(CO)_4~+ ions are formed mainly via ion-molecule reaction between Fe~+ and Fe(CO)_5 and dissociation following. A “ladder” model of Fe(CO)_5 photodissociation is presented in the paper. 相似文献
11.
12.
The dissociation and photoionization dynamics of C3H5Cl were studied at 200, 400, and 800 nm with femtosecond laser pulses. The time-of-flight mass spectra, laser power index and photoelectron images were recorded. At short wavelength (200 nm), ionization of the parent molecule was found to be the dominant channel, while other ions were generated by the dissociation of C3H5Cl+. With the shift to long wavelength (e.g., 800 nm), fragment ions became dominant, and were generated through the multiphoton ionization of neutral fragments after the photodissociation of C3H5Cl. These results imply that photodissociation plays a significant role at long wavelength, because neutral fragments are supposed to be generated from the intermediate states reached by 800 nm photons. At 400 nm, the dissociation on the intermediate states is also critical, but is not as high as that at 800 nm. Taken together, our results demonstrate that the dissociation/ionization behaviors of allyl chloride are wavelength-dependent, and reveal the complex dynamics of allyl chloride at 200, 400 and 800 nm. 相似文献
13.
汽车排放的主要污染物为CO,HC,NOx(x=1,2),SO2,Pb,苯丙芘,固体颗粒等[1],其尾气的检测对维护人类自身健康具有十分重要的意义.共振增强多光子电离光谱(Resonant Enhanced Multi-Photonionization,REMPI)是一种超灵敏光谱检测技术,它的灵敏度比LIF(Laser InducedFluorescence)还要高.1979年,Brophy和Rentttner[2]提出了REMPI可以作为检测大气污染的方法.后来,不同的研究小组采用了不同的REMPI方案对大气污染类分子进行了测量研究[3-6].由于采用可调谐染料激光器为光源,可以使用同一种染料对几种具有相近特征波长的分子进行同时测定.本文报 相似文献
14.
15.
硫氧化碳OCS是线性三原子分子,这类小分子的激发态、离子态能级结构、能级之间的相互作用及电离过程,是研究中所关心的问题.Tanaka等[1]和Kopp[2]测量了OCS的VUV吸收光谱,Frey和Schlag等[3]以同步辐射光源,用光电离共振(PIR)谱方法、Kovac[4]和Wang,Shirley等[5]以Hel为电离光源,分别采用传统的光电子能谱和高分辨光电子能谱技术研究了CO2、CS2和OCS分子从电子振动基态吸收单个光子而电离的过程.Yang和Anderson等问为了作选态的离子一分子反应利用可调谐激光rt光子吸收将OCS选择激发到某一中间态,OCS再吸收光子后… 相似文献
16.
17.
1引言呋喃分子在450nm附近的多光子电离实验中[1],质谱中观察不到母体离子C4H4O+,主要碎片离子的相对丰度C+>C2+=CHO+=C3H3+.这些离子的选质量光谱研究表明它们是呋喃分子先吸收3+1个光子电离为母体离子C4H4O+,然后C4H4O+再进一步吸收光子逐步解离产生.陕哺离子的初级解离过程已比较清楚[2-4],吹响离子能量在1~5eV之间解离通道是:这三个平行解离反应可用RRKM理论来描述[4].但是陕哺离子在高能量下的解离反应,特别是次级解离过程还不清楚,因此无法确定MPIF实验中观察到小离子碎片产生的机理,为此本文在速… 相似文献
18.
The multiphoton ionization and fragmentation pathway of furan at 450nm is analyzed on the basis of statistical theory and Ladder-Switching model. Our calculation indicates that fragmentation takes plase after furan molecules absorb six photons of 450nm, C+ begins to appear after absorption of nine photons, production of C2+ ions needs absorption of at least 15 photons. Our interesting result is that C+ ions is produced by dissociation of C3H+, CH2+ and C3+ ions, not of C2+ ions. Theoretically computed relative abundance of C+/C2+ after absorption 15photons agrees well with our experimental results. 相似文献
19.