摘要
脉冲激光烧蚀金属平面铝靶产生的热原子与气相CF4碰撞反应中 ,在 40 0— 60 0nm之间观测到激发态C2 分子的发光光谱 ,它们可归属为Swan带的d3Πg-a3Πu 跃迁中Δv=2 ,1,0 ,- 1,- 2五个振动序列 (v’≤ 6) .光谱强度分析表明 ,C2 激发态的振动温度达 63 40K左右 .与激光烧蚀Al+O2 反应生成AlO的实验结果以及激光烧蚀Cu +CF4的光谱比较 ,对比Al( 2 P1 2 - 2 S1 2 ,3 94 4nm)和C2 的d—a跃迁 ( 0— 0 )带带头 ( 5 16 5nm)的飞行时间轮廓 ,认为激发态的Al( 2 S1 2 )原子通过电子态传能可能是C2
The emission spectra of C-2 Swan band transition has been observed in the 430nm - 600nm region by Q-switch laser ablating target of Al and reacting with CF4 beam. Five vibrational band sequences (Deltav = 2, 1, 0, - 1 and - 2) of d(3)Pi(g)-alpha(3)Pi(u) are identified and the largest vibrational number of the excited state d is 6. Using a local thermal equilibrium model I the vibrational temperature of d state is about 6340K. Emission spectra from AlF have not been found. Comparing with the results of laser-ablated Al + O-2 system and similar experiment of Cu + CF4 system, while the time-of-flight profile of Al(P-2(1/2) - S-2(1/2),394.4nm) and (0, 0) band head of C-2 are analyzed, we consider that the primary reason of the producing of excited state d(3)Pi(g) is the electronic energy transformation between excited states Al (S-2(1/2)) and C-2.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期1297-1301,共5页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 2 0 0 730 42 )资助的课题~~
