Absolute rate constants for the reaction of silylene with hydrogen, silane, and disilane
摘要:
Absolute rate constants for the reaction of silylene with hydrogen, silane, and disilane have been determined from direct time resolved measurements of silylene removal at room temperature. Silylene was generated and detected using laser resonance absorption flash kinetic spectroscopy. The rate constants are pressure dependent, consistent with expectations for the insertion reactions typical of silylene. The pressure dependence of the overall rate constants has been determined from 1 to 100 Torr for reaction with hydrogen and silane and from 1 to 10 Torr for reaction with disilane. The results for reaction with hydrogen and silane have been successfully modeled using RRKM theory and high pressure bimolecular rate constants have been extracted. The rate constants determined in this work are significantly (10–104 times) faster than those calculated from literature values for the Arrhenius parameters. These findings require a significant upward revision in the heat of formation of silylene, and may require modification of chemical vapor deposition mechanism in which silylene is invoked as a film growth precursor.
Absolute rate constants for silylene reactions with diatomic molecules
作者:J.O. Chu、D.B. Beach、R.D. Estes、J.M. Jasinski
DOI:10.1016/0009-2614(88)87027-1
日期:1988.1
Absoluterateconstants have been determined for the reaction of SiH2 with the diatomics HCl, Cl2, NO and O2. Upper limits are reported for rateconstants for the reaction of SiH2 with N2 and CO. Comparisons are made between the reactivity of silylene, singlet methylene and halogenated silylenes.
Pressure-dependent isotope effect in the reaction of silylene (SiH2, 1A1) with acetylene and [2H2]acetylene
作者:Rosa Becerra、H. Monty Frey、Ben P. Masonb、Robin Walsh
DOI:10.1039/c39930001050
日期:——
Direct, time resolved measurements of absolute rate constants for reaction of SiH2(1A1) with C2H2 and C2D2 have revealed a pressure (and temperature) dependent isotope effect characteristic of an association process yielding an intermediate (silirene) which undergoes, amongst other reactions, a degenerate isotopic scrambling process.
Reactions of SiH2(X̄1A1) with H2, CH4, C2H4, SiH4 and Si2H6 at 298 K
作者:Gen Inoue、M. Suzuki
DOI:10.1016/0009-2614(85)80237-2
日期:1985.12
Reaction rate constants of SiH2(X̄1A1) have been directly measured for the first time using the laser photolysis—laser-induced fluorescence method. The preparation of SiH2 radical in the laser photolysis (193 nm) of phenylsilane and the concentration of the radical is demonstrated by a dye laser at 580.1 nm (X̄1A1-Ā1B1). The reaction rate constants of SiH2(X̄1A1) with H2, CH4, C2H4, SiH4 and Si2H6
的SiH的反应速率常数2(X 1阿1)已直接用于使用激光光解激光诱导荧光法的第一次测定。的SiH的制备2在苯基硅烷的激光光解(193纳米)和自由基的浓度的自由基是由染料激光器在580.1纳米(X证明1阿1 -A 1乙1)。的SiH的反应速率常数2(X 1阿1)用H 2,CH 4,C 2 H ^ 4,的SiH 4和Si 2 H ^图6的分子分别是0.001、0.01、0.97、1.1和5.7×10 -10 cm 3分子-1 s -1。对于的SiH 2(A 1个乙1(0.2,0))时,无碰撞的寿命为0.6微秒,对于他淬火速率常数是3.8×10 -10厘米3分子-1小号-1。
State-selective spectroscopic detection of reaction products (SiH2, Si) in the IR laser decomposition of SiH4
作者:Elisabetta Borsella、Roberta Fantoni
DOI:10.1016/0009-2614(88)87244-0
日期:1988.9
The decomposition mechanism of SiH2(1B1) formed after IR multiple-photon dissociation of SiH4 has been investigated by simultaneous acquisition of spontaneous chemiluminescence of SiH2 radicals and state-selective two-photon laser-induced fluorescence spectra of the atomic silicon produced. Evidence for the opening of an efficient dissociation channel leading to Si(1D2) + H2(1Σg+) from high vibrational
通过同时获取SiH 2自由基的自发化学发光和状态选择双光子激光诱导原子硅的荧光光谱,研究了SiH 4的IR多光子离解后形成的SiH 2(1 B 1)的分解机理。生产的。证据对于有效的解离导致的信道与Si(的开口1 d 2)+ H 2(1 Σ克+)从所述的SiH的高振动能级2(1乙1给出)的状态和讨论。
Detection of the SiH2 radical by intracavity laser absorption spectroscopy
作者:J.J. O'Brien、G.H. Atkinson
DOI:10.1016/0009-2614(86)80477-8
日期:1986.10
radical, SiH2, has been detected directly by absorption using intracavity laser spectroscopy under silane discharge conditions that produce silicon deposits. Rotationally resolved absorption spectra of the (020)+(000) and (010)-(000) vibronic bands in the à 1B1 ← X̃ 1A1 transition of SiH2 have been identified. The pressure of SiH2 in these experiments approaches 20 mTorr. Other absorption lines have