Relaxation of the nd → (n + 1)p Resonances in Atomic Bromine and lodine
Relaxation of the nd → (n + 1)p Resonances in Atomic Bromine and lodine
复制标题
原子溴和碘中 nd → (n + 1)p 共振的弛豫
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
F. C. Farnoux
中科院分区：
文献类型：
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作者：
L. Nahon;P. Morin;F. C. Farnoux
在4d(I)和3d(Br2)壳层激发区，分别由激光诱导I2和Br2光解产生的碘和溴原子被光激发。在吸收光谱中观察到强共振峰，并归属为→(n+1)p(2D5/2)跃迁。光电子能谱表明，这种激发态的主要衰变是自电离进入外壳，特别是进入单重态。将修正的Fano部分截面理论应用于碘原子近洛伦兹光电子能谱的特殊情况。进入5P-1和5S-1通道的衰变约占总衰减率的65%。此外，通过光致发光光谱，我们还测量了共振时的I~(2+)/I~+比值，与共振时测得的结果非常接近。这些结果与研究稀有气体中核里德堡Nd9N‘P共振衰变的结果有很大不同。另一方面，观测到了强大的(n+1)颗S一号卫星。这些卫星中的大多数是由于(n+1)S(n+1)P5(1P)构型和(n+1)S2(n+1)p3(n+1)d(1P)构型在末态强相互作用的结果。
Iodine and bromine atoms, respectively produced by laser-induced photo-dissociation of I2 and Br2, have been photoexcited in the region of the 4d (I) and 3d (Br) shell excitation. Strong resonances are observed in the absorption spectrum and are assigned to nd → (n+1)p(2D5/2) transitions. Photoelectra spectra reveal that the main decay of such excited states is autoionization into outer-shells, especially into the singlet states. A modified Fano theory for partial cross sections has been applied to the special case of nearly Lorentzian photoemission profiles in atomic iodine. The decay into the 5p-1 and 5s-1 channels amounts to about 65% of the total decay rate. Moreover, by photoin spectroscopy, we have measured the I2+/I+ ratio on the resonance, very close to the one measured off the resonance. These results are very different from those obtained in the study of the decay of core-to-Rydberg nd9n'p resonances in rare gases. On the other hand, strong (n + 1)s-1 satellites have been observed. It appears, that most of these satellites are due to a strong interaction in the final state between the parent (n + 1)s(n + 1)p5(1P) configuration and (n + 1)s2(n + 1)p3(n + 1)d(1P) satellites configurations.