NaK高位6~1∑^+态与H_2碰撞中转移能配置  

Transfer Energy Disposal in Collisions of NaK(6~1∑^+) with H_2

作　　者：朱永乐[1] 王淑英[1] 刘静[1] 仲崇玉[1] 阿布都艾尼.由力瓦斯 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《光谱学与光谱分析》2014年第4期884-887,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(11164028;11364042);新疆维吾尔自治区高校科研计划项目(XJEDU2011S01)资助

摘　　要：脉冲激光激发NaK 2~1Σ^+←1~1Σ^+跃迁,单模Ti宝石激光器激发2~1Σ^+至高位态6~1Σ^+,研究了6~1Σ^+与H_2碰撞中的碰撞转移。3D→4P(1.7μm)和5S→4P(1.24μm)荧光发射说明了预解离和碰撞解离的产生。在不同的H_2密度下,通过以上能级的荧光测量得到了预解离率,碰撞解离及碰撞转移速率系数Γ_(3D)~P=(5.3±2.5)×10~8 s^(-1),Γ_(5S)~P=(3.1±1.5)×10~8 s^(-1),k_(3D)=(3.7±1.7)×10^(-11)cm^3·s^(-1),k_(5S)=(2.9±1.4)×10^(-11)cm^3·s^(-1),k_(4P→4S)=(1.1±0.5)×10^(-11)cm^3·s^(-1),k_(3D→4P)=(6.5±3.1)×10^(-12)cm^3·s^(-1),k_(5S→4P)=(4.1±1.9)×10^(-12)cm^3·s^(-1)在不同H_2密度下,记录时间分辨荧光,由Stern-Volmer公式得到6~1Σ^+→2~1Σ^+,2~1Σ^+→1~1Σ^+的自发辐射寿命分别为(28±10)ns和(15±4)ns。6~1Σ^+→2~1Σ^+6~1Σ^+→1~1Σ^+及2~1Σ^+→1~1Σ^+分子态间与H_2的碰撞转移速率系数分别为(1.8±0.6)×10^(-11)cm^3·s^(-1),(1.6±0.5)×10^(-10)cm^3·s^(-1)和(6.3±1.9)×10^(-11)cm^3·s^(-1)。转移到H_2的振动、转动和平动能各占总转移能的0.58,0.03和0.39。主要能量转移至振动和平动能,支持6~1Σ^+-H_2间的共线型碰撞机制。The radiative lifetimes and rate coefficients for deactivation of high lying 61Σ＋ state of NaK by collisions with H2 were studied .An OPO laser was set to a particular 21Σ＋ ←11Σ＋ transition .Another single mode Ti sapphire laser was then used to excite molecule from 21Σ＋ level to the 61Σ＋ state .The predissociation was monitored by the atomic potassium emission at the 3D→4P （1.7 μm） or the S→4P（1.24μm） ,while bound state radiative processes were monitored by total fluorescence from the upper state to the various levels ,all studied as a function of H2 density .The values for predissociation ,collisional dissociation and collisional depopulation rate coefficients were obtained .The decay signal of the time resolved fluorescence from the 61Σ＋ →21Σ＋ ,61Σ＋ →11Σ＋ or 21Σ＋ →11Σ＋ transition was monitored .Based on the Stern-Volmer equation ,the radiative lifetimes were monitored for 61Σ＋ →21Σ＋ and 21Σ＋ →11Σ＋ transition .The rate coefficients for deactivation of collisions with H 2 were moni-tored for 61Σ＋ →21Σ＋ ,61Σ＋ →11Σ＋ and 21Σ＋ →11Σ＋ .When the density of H2 was 1019 cm -3 ,the total collisional transfer en-ergy （15 426 cm-1 ） and radiative energy （10 215 cm -1 ） were obtained .The relative fraction （＆lt;fv＆gt; ,＆lt;fR＆gt; ,＆lt;fT＆gt;） of average en-ergy disposal was derived as （0.58 ,0.03 ,0.39）;＆lt;fv＆gt; ,＆lt;fR＆gt; ,＆lt;fT＆gt; represent separately the relative fraction of average energy disposal among vibration ,rotation and translation .The major vibrational and translational energy release supports the assump-tion that the 61Σ＋-H2 collision occurs primarily in a collisional energy transfer mechanism .In this experiment ,alkali molecules relative energy population ratio was determined through using the time integrated intensity ,so we can get the total transfer ener-gy .That the NaK （61Σ＋ ） energy transfers to the H2 vibrational ,rotational and translational energy was q

关 键 词：激光光谱 碰撞能量转移 预解离 时间分辨荧光 NAK (61Σ+ )- H2 NaK(61Σ+ )+ H2 

分 类 号：O561.5[理学—原子与分子物理]