The λ_max, excitation energy (E_x), oscillator strength (f) and assignment of WR and W1–W7 molecules in gaseous phase.

Molecules	Calculated λmax (nm)	E x (eV)	(f)	Assignment
WR	663	1.87	2.88	H → L (+96%)
W1	691	1.79	2.93	H → L (+96%)
W2	682	1.82	2.96	H → L (+96%)
W3	670	1.85	3.01	H → L (+96%)
W4	677	1.83	3.16	H → L (+96%)
W5	671	1.85	2.93	H → L (+97%)
W6	668	1.86	3.22	H → L (+96%)
W7	674	1.84	3.15	H → L (+96%)