3149 20220922172525.0 10.3847/0004-637X/830/2/92 DOI SCART-2017-0027 Thomas, I. R. Optical and radiometric models of the NOMAD instrument part II: the infrared channels - SO and LNO 2016 NOMAD is a suite of three spectrometers that will be launched in 2016 as part of the joint ESA-Roscosmos ExoMars Trace Gas Orbiter mission. The instrument contains three channels that cover the IR and UV spectral ranges and can perform solar occultation, nadir and limb observations, to detect and map a wide variety of Martian atmospheric gases and trace species. Part I of this work described the models of the UVIS channel; in this second part, we present the optical models representing the two IR channels, SO (Solar Occultation) and LNO (Limb, Nadir and Occultation), and use them to determine signal to noise ratios (SNRs) for many expected observational cases. In solar occultation mode, both the SO and LNO channel exhibit very high SNRs >5000. SNRs of around 100 were found for the LNO channel in nadir mode, depending on the atmospheric conditions, Martian surface properties, and observation geometry. NO Vandaele, A. C. Robert, S. Neefs, E. Drummond, R. Daerden, F. Delanoye, S. Ristic, B. Berkenbosch, S. Clairquin, R. Maes, J. Bonnewijn, S. Depiesse, C. Mahieux, A. Trompet, L. Neary, L. Willame, Y. Wilquet, V. Nevejans, D. Aballea, L. Moelans, W. De Vos, L. Lesschaeve, S. Van Vooren, N. Lopez-Moreno, J.-J. Patel, M. R. Bellucci, G. Allen, Mark Altieri, Francesca Aoki, Shohei Bolsée, David Clancy, Todd Cloutis, Edward Daerden, Frank Fedorova, Anna Formisano, Vittorio Funke, Bernd Fussen, Didier Garcia-Comas, Maya Geminale, Anna Gérard, Jean-Claude Gillotay, Didier Giuranna, Marco Gonzalez-Galindo, Francisco Ignatiev, Nicolai Kaminski, Jacek Karatekin, Ozgur Kasaba, Yasumasa Lefèvre, Franck Lewis, Stephen López-Puertas, Manuel López-Valverde, Miguel Mahieux, Arnaud Mason, Jon McConnell, Jack Mumma, Mike Neary, Lori Neefs, Eddy Novak, Robert Renotte, Etienne Robert, Séverine Sindoni, Giuseppe Smith, Mike Trokhimovsky, Sacha Vander Auwera, Jean Villanueva, Geronimo Whiteway, Jim Willame, Yannick Wilquet, Valerie Wolff, Mike Alonso-Rodrigo, Gustavo Aparicio del Moral, Beatriz Barzin, Pascal BenMoussa, Ali Berkenbosch, Sophie Biondi, David Bonnewijn, Sabrina Candini, Gian Paolo Clairquin, Roland Cubas, Javier Giordanengo, Boris Gissot, Samuel Gomez, Alejandro Zafra, Jose- Jeronimo Leese, Mark Maes, Jeroen Mazy, Emmanuel Mazzoli, Alexandra Meseguer, Jose Morales, Rafael Orban, Anne Pastor-Morales, Maria del Carmen Perez-Grande, Isabel Rodriguez-Gomez, Julio Saggin, Bortolino Samain, Valérie Sanz Andres, Angel Sanz, Rosario Simar, Juan-Felipe Thibert, Tanguy. Optics Express 24 2016 4 3790-3805 boris.giordanengo@observatoire.be https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-4-3790 http://mars.aeronomie.be/multimedia/pdf/Thomas_16.pdf published in REFERD