### Abstract

The A1Π(v = 0) level of 12C18O has been reinvestigated using three different high-resolution spectroscopic methods: (1) 2 + 1′ resonance-enhanced multiphoton ionisation of the A1Π − X1Σ+(0, 0) band using narrowband lasers in a Doppler-free geometry; (2) Fourier-transform emission spectroscopy in the visible range probing the B1Σ+ − A1Π(0, 0) band in a discharge; (3) Fourier-transform absorption spectroscopy in the vacuum-ultraviolet range measuring the A1Π − X1Σ+(0, 0) and B1Σ+ − X1Σ+(0, 0) bands at multiple temperatures ranging from 90 to 900 K. An effective-Hamiltonian analysis of A1Π, v = 0 levels was performed up to J = 44 which quantitatively addresses perturbations by the e 3Σ−(v = 1), d3Δ(v = 4), a′3Σ+(v = 9), D 1Δ(v = 0), and I 1Σ−(v = 0, 1) levels.

Original language | English |
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Pages (from-to) | 3178-3191 |

Number of pages | 14 |

Journal | Molecular Physics |

Volume | 115 |

Issue number | 24 |

DOIs | |

Publication status | Published - 4 Aug 2017 |

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## Cite this

Trivikram, M., Hakalla, R., Heays, A. N., Niu, M., Scheidegger, S., Salumbides, E. J., ... Ubachs, W. (2017). Perturbations in the A1Π, v = 0 state of 12C18O investigated via complementary spectroscopic techniques.

*Molecular Physics*,*115*(24), 3178-3191. https://doi.org/10.1080/00268976.2017.1356477