Spectroscopy of H3+ and its impact on astrophysics

Since the original laboratory detection of an H-3(+) spectrum 20 years ago, the search has been on for astronomical observations of this important and fundamental molecular ion. Successful detection of H: in gas-giant planets, supernova ejecta and the interstellar medium as well as the prospects for future observations are discussed. The role H-3(+) has in determining the atmospheric structure of both the gas giants and cool metal-free planets is explored. (C) 2001 Elsevier Science B.V. All rights reserved.