Lewis B R, Baldwin K G H, Sprengers J P, Ubachs W, Stark G, Yoshino K
Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia.
J Chem Phys. 2008 Oct 28;129(16):164305. doi: 10.1063/1.2990655.
High-resolution laser-based one extreme-ultraviolet (EUV)+one UV two-photon ionization spectroscopy and EUV photoabsorption spectroscopy have been employed to study spin-forbidden (3)Pi(u)-X (1)Sigma(g) (+)(v,0) transitions in (14)N(2) and (15)N(2). Levels of the C (3)Pi(u) valence and 3ssigma(g)F(3) and 3ppi(u)G(3) (3)Pi(u) Rydberg states are characterized, either through their direct optical observation, or, indirectly, through their perturbative effects on the (1)Pi(u) and (1)Sigma(u) (+) states, which are accessible in dipole-allowed transitions. Optical observation of the G(3)-X(0,0) and (1,0) transitions is reported for the first time, together with evidence for six new vibrational levels of the C state. Following the recent observation of the F(3)-X(0,0) transition at rotational resolution [J. P. Sprengers et al., J. Chem. Phys. 123, 144315 (2005)], the F(3)(v=1) level is found to be responsible for a local perturbation in the rotational predissociation pattern of the b(') (1)Sigma(u) (+)(v=4) state. Despite their somewhat fragmentary nature, these new observations provide a valuable database on the (3)Pi(u) states of N(2) and their interactions which will help elucidate the predissociation mechanisms for the nitrogen molecule.
基于高分辨率激光的单极远紫外（EUV）+单极紫外双光子电离光谱和EUV光吸收光谱已被用于研究(^{14}N_2)和(^{15}N_2)中自旋禁戒的((3)\Pi_u - X(1)\Sigma_g^+(v,0))跃迁。通过直接光学观测或间接通过它们对((1)\Pi_u)和((1)\Sigma_u^+)态的微扰效应来表征(C(3)\Pi_u)价态以及(3s\sigma_gF(3))和(3p\pi_uG(3)(3)\Pi_u)里德堡态，这些态在允许偶极跃迁中是可及的。首次报道了(G(3)-X(0,0))和((1,0))跃迁的光学观测结果，以及C态六个新振动能级的证据。继最近在转动分辨率下观测到(F(3)-X(0,0))跃迁[J. P. Sprengers等人，《化学物理杂志》123，144315（2005）]之后，发现(F(3)(v = 1))能级是(b'(1)\Sigma_u^+(v = 4))态转动预解离模式中局部微扰的原因。尽管这些新观测结果有些零碎，但它们提供了关于(N_2)的((3)\Pi_u)态及其相互作用的宝贵数据库，这将有助于阐明氮分子的预解离机制。
