Disentangling UV photodesorption and photoconversion rates of H2O ice at 20 K - Measured with laser desorption post ionization mass spectrometryM. Bulak, D. M. Paardekooper, G. Fedoseev, P. Samarth and H. LinnartzA&A, 677 (2023) A99DOI: https://doi.org/10.1051/0004-6361/202245273