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International Journal of Spectroscopy
Volume 2012 (2012), Article ID 474639, 5 pages
http://dx.doi.org/10.1155/2012/474639
Research Article

Integrated Band Intensities of Ethylene ( 1 2 𝐂 2 𝐇 4 ) by Fourier Transform Infrared Spectroscopy

Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616

Received 22 June 2012; Accepted 22 July 2012

Academic Editor: Karol Jackowski

Copyright © 2012 G. B. Lebron and T. L. Tan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The integrated band intensities of ethylene (12C2H4) in the 640–3260 cm−1 region were determined by Fourier transform infrared (FTIR) spectroscopy. The infrared absorbance spectra of the 𝜈 7 and 𝜈 1 0 , 𝜈 1 2 , 𝜈 7 + 𝜈 8 , 𝜈 6 + 𝜈 1 0 , 𝑣 1 1 , and 𝜈 9 and 𝜈 2 + 𝜈 1 2 bands of ethylene recorded at a resolution of 0.5 cm−1 were measured at an ambient temperature of 296 K at various vapor pressures ranging from 3 × 1 0 5 to 1 × 1 0 3 atm to obtain respective Beer-Lambert's law plots. The measured integrated band intensities in cm−1/cm atm were 𝑆 ( 𝜈 9 a n d 𝜈 2 + 𝜈 1 2 ) = 1 1 2 . 2 0 ± 0 . 2 4 , 𝑆 ( 𝜈 1 1 ) = 5 5 . 3 5 ± 0 . 1 4 , 𝑆 ( 𝜈 1 2 ) = 4 1 . 2 2 ± 0 . 3 0 , and 𝑆 ( 𝜈 7 a n d 𝜈 1 0 ) = 3 2 8 . 6 6 ± 1 6 . 5 5 . In addition, the measured infrared band intensities of the 𝜈 7 + 𝜈 8 and 𝜈 6 + 𝜈 1 0 combination bands of ethylene are reported for the first time: 𝑆 ( 𝜈 7 + 𝜈 8 ) = 2 1 . 7 0 1 ± 0 . 0 2 8  cm−1/cm atm and 𝑆 ( 𝜈 6 + 𝜈 1 0 ) = 2 . 5 6 8 ± 0 . 0 2 5  cm−1/cm atm.