Four- and Two-Photon Absorption Cross-Section Measurements in Naphthalene Vapour
A.A. Ruth, A. Dragomir and D.N. Nikogosyan
For the first time, the four- and two-photon absorption cross-section values (s4 = (9 ± 7) ¥ 10-123 cm8 s3/mol and s2 = (2.5 ± 1.2) ¥ 10-55 cm4 s/mol) were obtained for naphthalene vapour. The determination of the four-photon absorption cross-section value is believed to be the first ever measurement of this subtle effect in a molecular gas.