# EVIDENCE FOR A NEW ELECTRONIC TRANSITION OF C$_{3}$ IN THE VACUUM ULTRAVIOLET AT 8 $K^{\ast}$

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 Title: EVIDENCE FOR A NEW ELECTRONIC TRANSITION OF C$_{3}$ IN THE VACUUM ULTRAVIOLET AT 8 $K^{\ast}$ Creators: Chang, Kok-Wai; Graham, W. R. M. Issue Date: 1982 Publisher: Ohio State University Abstract: A search for electronic spectra of carbon chain molecules has been carried out in absorption at wavelengths down to 1100 A. The products from the evaporation of graphite from a tantalum cell were trapped in Ar at 8 K. A new band system with origin at 1875. A was observed to grow in simultaneously with the $^{1}\pi_{u}-X^{1}{\Sigma_{g}}^{+}$ transition of $C_{3}$ which has been reported at 4102 A in Ar $matrices^{1}$. It is argued that the new spectrum can be assigned to a transition from the ground state to the ${^{1}\Sigma_{u}}^{+}$ excited state of $C_{3}$. Vibrational analysis yields the following frequencies: $\upsilon_{1}=1050 cm^{-1}, 2\upsilon_{2}=570 cm^{-1}$, and $2\upsilon_{3}=1490 cm^{-1}$ which support the proposed assignment. Description: $^{\ast}$Work supported by the Robert A. Welch Foundation. $^{1}$W. Weltner, Jr., and D. McLeod, Jr,. J. Chem. Phys. 40, 1299(1964); 41, 1305 (1964); 45, 3096(1960). URI: http://hdl.handle.net/1811/28980 Other Identifiers: 1982-WG-9