#DISTRIBUTEDBY=Aerosol Refractive Index Archive (www.atm.ox.ac.uk/project/RI/) #DESCRIPTION=Ground sample collected in Cheney Washington. #SUBSTANCE=Mt. St. Helens ash May 18 1980 eruption #SAMPLEFORM=Solid #TEMPERATURE= #CONCENTRATION= #DOI=10.1126/science.211.4484.836 #REFERENCE= E. Patterson, measurement of the imaginary refractive index ##between 300 and 700nm of Mount St. Helens ash, Science, 211, 1981 #CONTACT= #COMMENT=Digitised from publication graph, absolute accuracy is unknown. #FORMAT=WAVL K 0.30244225 0.0073462198 0.30911220 0.0057806401 0.31168906 0.0053818701 0.33094226 0.0043618400 0.35077896 0.0035055401 0.40182883 0.0025260199 0.48924677 0.0020742400 0.50574418 0.0020142901 0.58268837 0.0018450500 0.69697584 0.0016276400