[Microwave spectra of the molecules H/sub 2/O/sup 16/, H /sub 2/O/sup 17/, H/sub 2/O/sup 18/]

The 5/sub 2.3/ rarr 6/sub 1.6/ transition of the molecule H/sub 2/O/sup 17/ is measured at 13,535.51 MHz. The 2 /sub 2.0/ rarr 3/sub 1.3/ transitions of H/sub 2/O/sup 17 / and H/sub 2/O/sup 18/ are measured at 194,002.29 and 203,407.29 Mhz. The study of the quadripolar structure of the two transitions of the molecule H/sub 2/O/sup 17/ allows the identification to be confirmed. The simultaneous use of infrared results and some microwave measurements allows a calculation to be made of the molecular constants A, B and C for H/sub 2/O/sup 17/ and H/sub 2/O/sup 18/. The 3/sub 2.1/ rarr 4/sub 1.4/ transition of H/sub 2/O/sup 16/ in its nu /sub 2/ excited vibrational state is measured at 67,803.62 MHz.Francai