NO3 has been stabilized in a neon matrix at 4.3 K in sufficient yield for detection of the absorptions between 7000 and 10 000 cm(-1), which arise from vibronically allowed transitions from the ground state to levels of the (A) over tilde E-2 '' state. The results confirm and somewhat extend previous gas-phase observations for (NO3)-N-14-O-16. Additional spectra are presented for six other isotopologues of NO3, four of which possess C-2v symmetry. The splitting patterns for these species support the previous assignments. Alternations in the spacings of the v(4) progression are consistent with the occurrence of weak to moderate Jahn-Teller interaction in the A 2E state of NO3.