Cavity ringdown spectroscopy search for transition metal dimers Original Research Article

A reinvestigation of several isotopic species of Cr2 by the cavity ringdown technique yields a frequency of ΔG1/2=417±4 cm−1 for the A 1Σ+u state, and casts doubt on the assignment of a band near 21 700 cm−1 previously attributed to the 1–1 transition. Even though copious amounts of Ti2 were produced in our source, search for its transition reported in the same spectral region in matrices yielded no positive results. For both metals investigated, extremely strong absorptions of highly excited metastable atoms were detected.