Effective optical constants n and κ and extinction coefficient of silica aerogel Zeng, J. S. Q. ; Greif, R. ; Stevens, P. ; Ayers, M. ; Hunt, A. Abstract Publication: Journal of Materials Research Pub Date: March 1996 DOI: 10.1557/JMR.1996.0083 Bibcode: 1996JMatR..11..687Z