The absorption spectrum of the (1-0) band of the b(1)Sigma(+)(g) <-a(1)Delta(g) Noxon system near 1505 nm has been recorded by cw-CRDS in afterglow of a microwave discharge. The details of this method are presented along with spectroscopic data of 29 recorded lines of which 21 have been observed for the first time. The measured line positions are compared with positions calculated from rotational constants available in the literature. The density and the temperature of the generated singlet molecular oxygen O-2(a(1)Delta(g)) are presented. (c) 2008 Elsevier B. V. All rights reserved.