Abstract

Far-ultraviolet (FUV) spectra of <i>n</i>-alkanes (<i>n</i> = 5–14) and branched alkanes were measured in their liquid state by using a newly developed attenuated total reflection (ATR)-FUV spectrometer to investigate spectra–structure relationship in the FUV region. The <i>n</i>-alkanes show a broad band near 8.3 eV and a weak shoulder near 7.7 eV. The 8.3 eV band shows a lower energy shift with a significant intensity increase with the increase in the length of alkyl chain. We have assigned the 8.3 eV band to the overlap of two bands due to the transition from the highest occupied molecular orbital (HOMO) to 3p and that from the HOMO-1 to 3s based on the observation that the peak energy of the 8.3 eV band of the <i>n</i>-alkanes is proportional to the first ionization energy. The 7.7 eV shoulder may be due to the transition from HOMO to 3s. The intensity of the 7.7 eV band increases markedly in the order of alkanes without branch, with tertiary, and with quaternary carbon atoms. It is very likely that the forbidden transition from HOMO to 3s becomes allowed by the large decrease in symmetry upon going from the <i>n</i>-alkanes to the branched ones with the quaternary carbon, respectively.

Dispersion effects on infrared spectra in attenuated total reflection

Rabah Belali, Jean-Marie Vigoureux, and Joseph Morvan
J. Opt. Soc. Am. B 12(12) 2377-2381 (1995)

Simple ultraviolet calibration source with reference spectra and its use with the Galileo orbiter ultraviolet spectrometer

J. M. Ajello, D. E. Shemansky, B. Franklin, J. Watkins, S. Srivastava, G. K. James, W. T. Simms, C. W. Hord, W. Pryor, W. McClintock, V. Argabright, and D. Hall
Appl. Opt. 27(5) 890-914 (1988)

Attenuated total reflectance spectroscopy with chirped-pulse upconversion

Hideto Shirai, Constance Duchesne, Yuji Furutani, and Takao Fuji
Opt. Express 22(24) 29611-29616 (2014)

Direct optical measurements of far- and deep-ultraviolet surface plasmon resonance with different refractive indices

Ichiro Tanabe, Yoshito Y. Tanaka, Takayuki Ryoki, Koji Watari, Takeyoshi Goto, Masakazu Kikawada, Wataru Inami, Yoshimawa Kawata, and Yukihiro Ozaki
Opt. Express 24(19) 21886-21896 (2016)

Interpretation of attenuated-total-reflection dips observed in surface plasmon resonance

Takashi Wakamatsu and Kazuhiro Saito
J. Opt. Soc. Am. B 24(9) 2307-2313 (2007)