Ro-vibronic spectra of the ¹³C¹⁸O carbon monoxide isotopologue were obtained with (i) emission spectroscopy in the visible region using a Bruker IFS 125HR spectrometer (University of Rzeszów) and (ii) vacuum-ultraviolet absorption spectroscopy using the wave-front-division spectrometer on the DESIRS beamline of the SOLEIL synchrotron. A deperturbation analysis of the ¹³C¹⁸O A¹Π(v = 1) level was conducted from 598 observed transitions from the B¹Σ⁺ - A¹Π(0, 1), C¹Σ⁺ - A¹Π(0, 1), A¹Π - X¹Σ⁺(1, 0), B¹Σ⁺ - X¹Σ⁺(0, 0), C¹Σ⁺ - X¹Σ⁺(0, 0), I¹Σ^– - X¹Σ⁺(2, 0) bands and five further nominally forbidden bands. An effective Hamiltonian and term-value fitting analysis was implemented. Consequently, 135 parameters were floated: 23 molecular parameters, including molecular constants for A¹Π(v = 1), I¹Σ^–(v = 2), d³Δ(v = 6), e³Σ^–(v = 3) and D¹Δ(v = 1); rotation-electronic (L-uncoupling) mixing of A¹Π(v = 1) ∼ [D¹Δ(v = 1), I¹Σ^–(v = 1), I¹Σ^–(v = 2)] and spin–orbit interaction parameters for A¹Π(v = 1) ∼ [d³Δ(v = 6), e³Σ^–(v = 3), aʹ³Σ⁺(v = 11)]; the spin–orbit/spin-electronic/L-uncoupling a³Π(v = 12) ∼ d³Δ(v = 5) and spin–orbit a³Π(v = 12) ∼ [D¹Δ(v = 1), I¹Σ^–(v = 2)] perturbation parameters; as well as 112 ro-vibronic term values of B¹Σ⁺(v = 0) up to J = 50 and C¹Σ⁺(v = 0) up to J = 60. The significant, indirect a³Π(v = 12) ∼ [e³Σ^–(v = 2, 3), d³Δ(v = 5, 6)] ∼ A¹Π(v = 1) spin–orbit/spin-electronic/L-uncoupling interaction and a³Π(v = 12) ∼ [I¹Σ^–(v = 2), D¹Δ(v = 1)] ∼ A¹Π(v = 1) spin–orbit/L-uncoupling interaction were detected and analysed. Thus, this study, using modern experimental methods and deperturbation analysis, leads to a much improved description in terms of molecular constants and interaction parameters, compared to previous studies of the A¹Π(v = 1) energy region in the ¹³C¹⁸O isotopologue. This research is a continuation of the studies on the A¹Π state and its numerous perturbers in the CO isotopologues made by our team.

¹³ C ¹⁸ O 一氧化碳同位素体的 Ro-vibronic 光谱通过(i)使用 Bruker IFS 125HR 光谱仪 (University of Rzeszów) 在可见区域的发射光谱和(ii)使用波前的真空紫外吸收光谱获得SOLEIL同步加速器的DESIRS光束线上的分光光谱仪。^{从 B 1} Σ ⁺ - A ¹ Π(0, 1)、C ¹ Σ ⁺ - A ¹观察到的 598 个跃迁对¹³ C ¹⁸ O A ¹ Π( v  = 1) 能级进行了扰动分析Π(0, 1), A ¹ Π - X ¹ Σ ⁺ (1, 0), B ¹ Σ ⁺ - X ¹ Σ ⁺ (0, 0), C ¹ Σ ⁺ - X ¹ Σ ⁺ (0, 0) , I ¹ Σ ^– - X ¹ Σ ⁺ (2, 0) 频带和另外五个名义上禁止的频带。实施了有效的哈密顿量和项值拟合分析。因此，浮动了 135 个参数：23 个分子参数，包括 A ¹ Π( v  = 1)、I ¹ Σ ^- (v  = 2), d ³ Δ( v  = 6), e ³ Σ ^– ( v  = 3) 和 D ¹ Δ( v  = 1); A ¹ Π ( v = 1 )  ∼ [D ¹ Δ( v  = 1), I ¹ Σ ^– ( v  = 1), I ¹ Σ ^– ( v  = 2)] 和A ¹ Π( v  = 1) ∼ [d ³ Δ( v  = 6), e ³ Σ ^-的自旋轨道相互作用参数( v  = 3), aʹ ³ Σ ⁺ ( v  = 11)]; 自旋轨道/自旋电子/ L-解耦 a ³ Π( v  = 12) ∼ d ³ Δ( v  = 5) 和自旋轨道 a ³ Π( v  = 12) ∼ [D ¹ Δ( v  = 1 ), I ¹ Σ ^– ( v  = 2)] 扰动参数；以及 B ¹ Σ ⁺ ( v  = 0) 的 112 个 ro-vibronic 项值，直至J  = 50 和 C ¹ Σ ⁺ ( v = 0) 直到J  = 60。显着的、间接的 a ³ Π( v  = 12) ∼ [e ³ Σ ^– ( v  = 2, 3), d ³ Δ( v  = 5, 6)] ∼ A ¹ Π ( v  = 1) 自旋-轨道/自旋-电子/ L-解耦相互作用和a ³ Π( v  = 12) ∼ [I ¹ Σ ^– ( v  = 2), D ¹ Δ( v  = 1)] ∼ A ¹ Π( v  = 1) 自旋轨道/ L-检测和分析解偶联相互作用。^{因此，与之前对13} C ¹⁸ O中的 A ¹ Π( v  = 1) 能量区的研究相比，本研究使用现代实验方法和去扰动分析，在分子常数和相互作用参数方面得到了大大改进的描述同位素体。这项研究是我们团队对 A ¹ Π 状态及其在 CO 同位素体中的众多干扰物进行的研究的延续。