The F + para-H2 → HF + H reaction is an important source of HF in interstellar clouds; however, its unusually high rate and its dynamics at low temperature are not fully understood. Now, quantum-state resolved crossed-beam scattering measurements and anion photoelectron spectroscopy have revealed that this reactivity is caused by a resonance-enhanced tunnelling effect involving a post-barrier resonance state.
- Tiangang Yang
- Long Huang
- Daniel M. Neumark
