Abstract
Photoabsorption spectra of 14N15N were recorded at high resolution with a vacuum-ultraviolet Fourier-transform spectrometer fed by synchrotron radiation in the range of 81-100 nm. The combination of high column density (3 × 1017 cm-2) and low temperature (98 K) allowed for the recording of weak spin-forbidden absorption bands' exciting levels of triplet character. The triplet states borrow intensity from 1Πu states of Rydberg and valence character while causing their predissociation. New predissociation linewidths and molecular constants are obtained for the states C3Πu(v = 7, 8, 14, 15, 16, 21), G3Πu(v = 0, 1, 4), and F3Πu(v = 0). The positions and widths of these levels are shown to be well-predicted by a coupled-Schrödinger equation model with empirical parameters based on experimental data on 14N2 and 15N2 triplet levels.
| Original language | English |
|---|---|
| Article number | 224305 |
| Pages (from-to) | 1-13 |
| Number of pages | 13 |
| Journal | Journal of Chemical Physics |
| Volume | 151 |
| Issue number | 22 |
| Early online date | 11 Dec 2019 |
| DOIs | |
| Publication status | Published - 14 Dec 2019 |
Funding
This work has been carried out within the framework of the Dutch Astrochemistry Network funded by NWO. The authors are grateful to the staff at Soleil for their hospitality and operation of the facility under Project No. 20120023. For portions of this work, A.H. was funded by the NASA Postdoctoral Program through the NASA Astrobiology Institute. The authors would like to thank Dr. E. F. van Dishoeck for valuable discussions on N2 predissociation dynamics, including their significance in isotopic fractionation.
