# DIRECT ABSORPTION SPECTROSCOPY OF CARBON CLUSTERS IN THE VISIBLE REGION

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 Title: DIRECT ABSORPTION SPECTROSCOPY OF CARBON CLUSTERS IN THE VISIBLE REGION Creators: Scappini, F.; Yan, W.- B.; Amano, T. Issue Date: 1991 Publisher: Ohio State University Abstract: Direct absorption spectroscopy with a dye laser as a radiation source has been employed to detect electronic transitions of carbon clusters. To enhance the sensitivity, concentration modulation technique in a cooled hollow cathode discharge is used. The technique has proved to be a sensitive method for detection of ions and free radicals in the infrared region with a difference-frequency laser as a radiation source. As the noise sources of the difference-frequency laser are the $Ar^{+}$ and dye lasers, similar sensitivity is expected to be attained in visible absorption spectroscopy with a dye laser. In this investigation, absorption spectra were recorded in the 16900-17100 $cm^{-1}$ region in a hollow cathode discharge in a mixture of $C_{2}H_{2}$ and He. The same lines were also observed in the discharge of $C_{2}H_{4}$, $C_{2}H_{6}$, $C_{3}H_{6}$, $C_{3}H_{8}$, and $C_{2}D_{6}$. As the fully deuterated ethane yielded the same spectra, we conclude the carrier (or carriers) of the spectra contains no hydrogen. Description: Author Institution: Istituto di Spettroscopia Molecolare del CNR; Herzberg Institute of Astrophysics, National Research Council URI: http://hdl.handle.net/1811/12348 Other Identifiers: 1991-FB-7