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TWO PHOTON EXCITATION OF THE $D^{1}\Delta - X^{1}\Sigma^{+}$ TRANSITION IN CO
Carter Kittrell, Stewart M. Cameron, R F Barrow, Laurie J. Butler, Robert W. Field
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Abstract
A frequency doubled pulsed dye laser is used to promote two-photon excitation of the $D^{1}\\Delta - X^{1}\\Sigma^{+}$ transition in carbon monoxide. Collisional transfer to $A^{1}\\Pi$ leads to ultraviolet fluorescence which is detected with a solar blind photomultiplier. Rotationally resolved structure belonging to bands of three isotopically substituted molecules has been measured relative to the visible spectrum of iodine. Several vibrational bands up to $v^{\\prime} = 12$ have been analyzed and these data, combined with Simmons and Tilford’s$^{1}$ values for $v^{\\prime} = 1$, give the molecular constants. Preliminary values for $^{12}CO$ are: $T_{e} = 65,975.8(5); \\omega_{e} = 1061.7(3); \\omega_{e}x_{e} = 9.86(4); B_{e} = 1.259(4); D_{e} = 7\\times10^{-6} \\alpha_{e} = .018(1)$ (all $cm^{-1}$). $^{1}$J.D. Simmons and S.G. Tilford, J. Chem. Phys. 45, 2965 (1966).