01852nas a2200181   4500008004100000022001400041245011900055210006900174260007100243300001400314490000800328520112900336100002701465700001701492700001801509700001601527856012701543       2014                        eng d  a1089-563900aStructure, stability, and properties of the trans peroxo nitrate radical: the importance of nondynamic correlation0 aStructure stability and properties of the trans peroxo nitrate r  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a1350-13620 v1183 a<p>We report a comparative single-reference and multireference coupled-cluster investigation on the structure, potential energy surface, and IR spectroscopic properties of the trans peroxo nitrate radical, one of the key intermediates in stratospheric NOx chemistry. The previous single-reference ab initio studies predicted an unbound structure for the trans peroxo nitrate radical. However, our Fock space multireference coupled-cluster calculation confirms a bound structure for the trans peroxo nitrate radical, in accordance with the experimental results reported earlier. Further, the analysis of the potential energy surface in FSMRCC method indicates a well-behaved minima, contrary to the shallow minima predicted by the single-reference coupled-cluster method. The harmonic force field analysis, of various possible isomers of peroxo nitrate also reveals that only the trans structure leads to the experimentally observed IR peak at 1840 cm(-1). The present study highlights the critical importance of nondynamic correlation in predicting the structure and properties of high-energy stratospheric NOx radicals.</p>1 aDutta, Achintya, Kumar1 aDar, Manzoor1 aVaval, Nayana1 aPal, Sourav  uhttps://library.ncl.res.in/content/structure-stability-and-properties-trans-peroxo-nitrate-radical-importance-nondynamic-0