Visible line intensities of the triatomic hydrogen ion from experiment and theory

Abstract

The visible spectrum of H3+ is studied using high-sensitivity action spectroscopy in a cryogenic radiofrequency multipole trap. Advances are made to measure the weak ro-vibrational transitions from the lowest rotational states of H3+ up to high excitation energies providing visible line intensities and, after normalisation to an infrared calibration line, the corresponding Einstein $B$ coefficients. {\it Ab initio} predictions for the Einstein $B$ coefficients are obtained from a highly precise dipole moment surface of H3+ and found to be in excellent agreement, even in the region where states have been classified as chaotic.

arXiv comment4 pages, 1 figure

References in corpus (4)

• Investigating the Cosmic-Ray Ionization Rate in the Galactic Diffuse Interstellar Medium through Observations of H3+
• Chemical probing spectroscopy of H3+ above the barrier to linearity
• QED correction for H${}_3^{+}$
• The effect of the electron donor H3+ on the pre-main and Main Sequence evolution of low mass zero metallicity stars

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• Perspective: Accurate ro-vibrational calculations on small molecules
• ExoMol molecular line lists XX: a comprehensive line list for H${}_3^{+}$
• ExoMol line lists -- L: High-resolution line lists of H${}_3^{+}$, H${}_2$D${}^{+}$, D${}_2$H${}^{+}$ and D${}_3^{+}$
• A hybrid variational-perturbation calculation of the ro-vibrational spectrum of nitric acid
• High accuracy calculations of the rotation-vibration spectrum of H${}_3^{+}$