Infrared laser spectroscopy of jet-cooled carbon clusters: The ν5 band of linear C9

Abstract

The nu 5 antisymmetric stretching vibration of 1 sigma+g C9 has been observed using direct infrared diode laser absorption spectroscopy of a pulsed supersonic cluster beam. Twenty-eight rovibrational transitions measured in the region of 2079-2081 cm-1 were assigned to this band. A combined least squares fit of these transitions with previously reported nu 6 transitions yielded the following molecular constants for the nu 5 band: nu 0 = 2 079.673 58(17) cm-1, B"= 0.014 321 4(10) cm-1, and B'=0.014 288 9(10) cm-1. The IR intensity of the nu 5 band relative to nu 6 was found to be 0.108 +/- 0.006. Theoretical predictions for the relative intensities vary widely depending upon the level of theory employed, and the experimental value reported here is in reasonable agreement only with the result obtained from the most sophisticated ab initio calculation considered (CCSD).

The Indonesian Digital Library Network Is Born to Struggle with the Digital Divide

“…Carbon clusters deposited in argon and neon matrices show three stretching modes at 2067.8, 2074.5, and 2081.1 cm −1 ,8, 19 which have been assigned to the linear carbon clusters C 8 , C 10 , and C 9 , respectively. A rotationally resolved gas‐phase spectrum of C 9 at 2079.67 cm −1 has confirmed the assignment of the 2081.1 cm −1 matrix feature 20. In this paper we have extended the search for C 10 with high resolution to the 2073–2076 cm −1 spectral region.…”

Chemical Evolution of a Co Ice Induced by Soft X-Rays

“…The C 6 feature at 1949 cm −1 has also been detected in proton irradiation experiments of CO ice (Trottier & Brooks 2004). The feature at 2077 cm −1 associated withC 3 O 2 shows a second peak around 2079 cm −1 that could be compatible with the ν 5 stretch of C 9 chains (Szczepanski et al 1996;Van Orden et al 1996). The presence of such a species is also confirmed by the presence of the band at 1996 cm −1 associated with the ν 6 stretch (Vala et al 1988;Kurtz & Huffman 1990) of the same molecule.…”

A Systematic Application of Density Functional Theory to Some Carbon-Containing Molecules and Their Anions

“…It has been established that carbon clusters with fewer than ten atoms have linear ground state structures, and there is recent evidence that linear carbon clusters with up to 16 atoms exist . There has been a wide range of spectroscopic studies of linear carbon chains performed to learn about their formation and properties. ,− Individually, C 6 , − C 7 , ,, C 8 , and C 9 ,, have been studied for their vibrational and electronic spectra both in the gas phase and in matrix isolation experiments. For a comprehensive overview of the chemistry of small carbon clusters, refer to the recent review by Orden and Saykally .…”