@article{12126, keywords = {Computer simulation, Electric fields, Light matter interactions, Nonlinear optics, Numerical simulation, Optical fields}, author = {Jonathan Heinz and Ran Reiff and Tennesse Joyce and Andreas Becker and Agnieszka Jaron-Becker and Miroslav Kolesik}, title = {Nonlinear polarization and ionization in O2: metastable electronic state model}, abstract = {We present a computational model for the nonlinear response of molecular oxygen exposed to strong mid-wavelength and long-wavelength infrared optical fields. Based on a non-Hermitian approach utilizing metastable electronic states, the nonlinear polarization and strong-field ionization are described as intimately connected properties. Good agreement with the measured nonlinear index and ionization rates is shown, and parameterized response functions are provided to facilitate applications in large-scale simulations of infrared optical pulses interacting with gaseous media.}, year = {2020}, journal = {Opt. Express}, volume = {28}, chapter = {25022-25036}, number = {17}, pages = {25022-25036}, month = {2020-08}, publisher = {OSA}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-28-17-25022}, doi = {10.1364/OE.399719}, }