光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
11期
2887-2891
,共5页
王淑英%李佳灵%戴康%沈异凡
王淑英%李佳靈%戴康%瀋異凡
왕숙영%리가령%대강%침이범
能量转移%受激发射泵浦%激光诱导荧光%速率系数%高振动激发Na2-Ar ,H2
能量轉移%受激髮射泵浦%激光誘導熒光%速率繫數%高振動激髮Na2-Ar ,H2
능량전이%수격발사빙포%격광유도형광%속솔계수%고진동격발Na2-Ar ,H2
Energy transfer%Stimulated emission pumping%Laser induced fluorescence%Rate constant%Highly vibrationally excited Na2-Ar,H2
受激发射泵浦（SEP）激发Na2（X1Σ＋g ）的（v＝33～51， J＝11）高位振动态，利用激光诱导荧光（LIF）光谱研究了Na2（X）高位振动态分别与Ar和 H2的碰撞能量转移过程。SEP布居的高位态粒子的衰减曲线是一纯指数函数，由此得到总碰撞转移速率系数，它们随振动能级的增加而线性增加。测量从νp ＝48， Jp ＝11转移到（47， J）态上布居的L IF光强的相对强度，得到相对转移速率系数，再由总转移速率系数得到态-态转移的绝对速率系数。对于Na2（ν）＋Ar ，多量子弛豫没有观察到。对于Na（ν＝48）＋ H2，由泵浦得到的高位态ν＝48上的布居的相当大的部分直接弛豫到较低能级ν＝43（Δν＝-5），所用的弛豫时间比位于ν＝48和43中间的态之间的碰撞时间还要短，故相继单量子弛豫的机制可消除。对于ν＝48，至少有占其布居数的40％的粒子经历了多量子振动弛豫过程，对这种过程的可能机制进行了讨论。
受激髮射泵浦（SEP）激髮Na2（X1Σ＋g ）的（v＝33～51， J＝11）高位振動態，利用激光誘導熒光（LIF）光譜研究瞭Na2（X）高位振動態分彆與Ar和 H2的踫撞能量轉移過程。SEP佈居的高位態粒子的衰減麯線是一純指數函數，由此得到總踫撞轉移速率繫數，它們隨振動能級的增加而線性增加。測量從νp ＝48， Jp ＝11轉移到（47， J）態上佈居的L IF光彊的相對彊度，得到相對轉移速率繫數，再由總轉移速率繫數得到態-態轉移的絕對速率繫數。對于Na2（ν）＋Ar ，多量子弛豫沒有觀察到。對于Na（ν＝48）＋ H2，由泵浦得到的高位態ν＝48上的佈居的相噹大的部分直接弛豫到較低能級ν＝43（Δν＝-5），所用的弛豫時間比位于ν＝48和43中間的態之間的踫撞時間還要短，故相繼單量子弛豫的機製可消除。對于ν＝48，至少有佔其佈居數的40％的粒子經歷瞭多量子振動弛豫過程，對這種過程的可能機製進行瞭討論。
수격발사빙포（SEP）격발Na2（X1Σ＋g ）적（v＝33～51， J＝11）고위진동태，이용격광유도형광（LIF）광보연구료Na2（X）고위진동태분별여Ar화 H2적팽당능량전이과정。SEP포거적고위태입자적쇠감곡선시일순지수함수，유차득도총팽당전이속솔계수，타문수진동능급적증가이선성증가。측량종νp ＝48， Jp ＝11전이도（47， J）태상포거적L IF광강적상대강도，득도상대전이속솔계수，재유총전이속솔계수득도태-태전이적절대속솔계수。대우Na2（ν）＋Ar ，다양자이예몰유관찰도。대우Na（ν＝48）＋ H2，유빙포득도적고위태ν＝48상적포거적상당대적부분직접이예도교저능급ν＝43（Δν＝-5），소용적이예시간비위우ν＝48화43중간적태지간적팽당시간환요단，고상계단양자이예적궤제가소제。대우ν＝48，지소유점기포거수적40％적입자경력료다양자진동이예과정，대저충과정적가능궤제진행료토론。
Energy transfer rate constants were measured for excited rovibrational levels of Na2 (X1Σ+g ) .Stimulated emission pumping was used to excited the levelsν=33~51 ,J=11 viaA-X transition .Laser induced fluorescence was used to follow the collision dynamics .Energy transfer processes induced by collisions with Ar and H2 were investigated .The decay curves for the parent level populations gave good fits to single exponential function .At ν= 33~51 ,the total transfer rate constants increase linearly with vibrational quantum number .Parameterized expressions for the (48 ,11)- to -(47 ,J) rate constants were fitted to the fractional populations of the satellite lines .This produced sets of relative rate constants .Absolute rate constants were then obtained by normalizing the sums of the relative rate constants to the total removal rate constants .For Na2 (ν)+ Ar ,no multiquantum vibrational transfer was detected .For Na2 (ν)+ H2 ,a significant fraction of the initial population of highly vibra-tionally excited Na2 (Xν=48) relaxes to lower vibrational level (Δν= -5) .The time scale is much shorter than the known colli-sional lifetimes of the intervening vibrational levels and thus a sequential single-quantum relaxation mechanism can be explicitly ruled out .For ν=48 ,at least 40% of the initially prepared population ,undergoes multiquantum vibrational relaxation .We dis-cuss possible explanations of this result .
