摘要
用双色共振多光子电离光谱(REMPI)方法,在77K温度下对^(12)CO(A^1H)与^(13)CO(X^1∑^+)之间的碰撞传能过程进行了研究.发现二者之间的电子能量转移极快,并测量了其不同振动通道的速率,得到^(12)CO(A^1П)V=1、2、3与^(13)CO(X^1∑^+)V=0之间的电子传能总截面分别为114±42、22±4、17±6∧~2,还测量了产物的∧分裂П^+和П^-的布局比,发现П^+布居总是多于П^-.从激基复合物生成的观点对传能机理和∧双重态布居的倾向性进行了讨论。
The energy transfer processes between ^(12)CO(A^1Π) and ^(13)CO(X ~1Σ^+) were studiedat 77K by using the technique of two-color resonance enhanced multiphoton ioniza-tion spectroscopy. In a static cell with a mixture of 0.92 ^(13)CO + 0.08 ^(12)CO, ^(12)COmolecules were populated to the A state by 2-photon excitation using an UV dyelaser. The ^(13)CO(A) resulted from the collision E-E energy transfer were detected byCO(A)→CO(B)→CO^+ (X) 2-step ionization using a visible dye laser. The energytransfer processes were found to be very fast with total cross sections of 114±42,22±4, 17±6A^2 for ^(12)CO(A) V = 1, 2, 3 respectively. We found that for differentvibrational channels, cross section decreases with increasing energy mismatch ΔE.Another interesting result is that, for the A doublet, the production of Π^+ is alwayslarger than that of Π^-. The formation of an intermediate exciplex [OCCO] is pro-posed to explain the experimental results.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1990年第5期534-540,共7页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
