{TAIL ~ An optical recording medium} having {HEAD ~ 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 
{ TAIL ~ An optical recording medium } having { HEAD ~ 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
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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