The laser-induced fluorescence spectra of the jet-cooled ScO molecules have been investigated in the 27,400−28,000 cm⁻¹ region at 0.04 cm⁻¹ resolution. The D²Σ⁺ state of ScO, predicted by the earlier ab initio studies, was observed in v = 0 vibration from the ground X²Σ⁺ state. The C²Π_i state, earlier reported by us in vibrations v = 0−3, was also observed in v = 4 along with the A²Π_r state in v = 14 vibration. The energetically overlapping v = 0 of the D²Σ⁺ and v = 4 of the C²Π_i states are perturbed by homogeneous spin-orbit, spin-electronic and J-dependent L-uncouple interactions. The rotational transition wavenumbers of the D²Σ⁺−X²Σ⁺(0,0) and C²Π_i−X²Σ⁺(4,0) bands were fitted together using single Hamiltonian matrix that included ²Π and ²Σ⁺ matrix elements and their off-diagonal elements. The deperturbed D²Σ⁺, v = 0 state was found to be only 11.5 cm⁻¹ below that of the C²Π_3/2, v = 4 sub-state and f- and e-levels respectively cross after J = 12.5 and 28.5. The dispersed fluorescence and wavelength separated excitation spectra were crucial in understanding spectra and the deperturbation analysis of these interacting vibronic states. The D²Σ⁺, v = 0 state showed J- and parity-dependent mixing up to ∼45% by the C²Π_i, v = 4 state and is reflected in the disperse fluorescence spectra. The radiative lifetimes of the A²Π_r, C²Π_i and D²Σ⁺ states respectively in 14, 4 and 0 vibrations also indicate that the C−D as well as A−C states interact. The observed sign and relative magnitude of the spin-rotation constant γ of the ground X²Σ⁺, and excited D²Σ⁺states are elucidated qualitatively in light of second-order contribution to γ from the A ²Π_r and C ²Π_i states.

已经在27,400-28,000 cm ^-1区域以0.04 cm ^-1的分辨率研究了喷射冷却的ScO分子的激光诱导荧光光谱。该d ² Σ ⁺状态SCO的，由先前的预测从头研究中，观察到v  = 0的振动从地面X ² Σ ⁺状态。的c ^ ² Π_我状态，早些时候我们在振动报道v  = 0-3，也观察到在v  = 4与沿阿² Π _ř在状态v = 14次振动。能量上重叠v 所述的= 0 d ² Σ ⁺和v 的= 4 c ^ ² Π_我状态是由同质的自旋轨道，自旋电子和扰动Ĵ依赖性大号-uncouple相互作用。所述的旋转跃迁的波数d ² Σ ⁺ - X ² Σ ⁺（0,0）和c ^ ² Π_我- X ² Σ ⁺（4,0）的条带接合在一起使用单哈密顿矩阵，其中包括² Π和^2个Σ ⁺矩阵元素和它们的非对角元素。所述deperturbed d ² Σ ⁺，v  = 0的状态被认为是仅11.5厘米^-1以下，所述的C ^ ² Π _3/2，v  = 4的子状态和F-和Ë -levels后分别横Ĵ  = 12.5和28.5。分散的荧光和波长分离的激发光谱对于理解光谱和对这些相互作用的振动状态的去扰动分析至关重要。该d ² Σ ⁺，v  = 0状态表明Ĵ -和奇偶依赖性由混合达〜45％c ^ ² Π_我，V  = 4状态和反映在分散荧光光谱。所述的辐射寿命阿² Π _{- [R}，C ² Π_我和d ² Σ ⁺  14，图4和0分别振动状态也表明，Ç - d以及甲- Ç状态相互作用。所观察到的符号和接地的自旋旋转常数γ的相对大小X ² Σ ⁺和兴奋d ^2个Σ ⁺状态在光从到γ二阶贡献定性阐明阿 ² Π _{- [R}和c ^ ² Π_我指出。