{HEAD ~ An optical recording medium} having {TAIL ~ a recording layer} provided on a substrate, said recording layer comprising an organic thin film containing at least one diazulenium salt compound represented by the formula , or , and a recording method using it 
having
{ HEAD ~ An optical recording medium } having { TAIL ~ a recording layer } provided on a substrate , said recording layer comprising an organic thin film containing at least one diazulenium salt compound represented by the formula , or , and a recording method using it
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH