Go to  Advanced Search

Identification of a ¹Δ [delta] u - ¹Σ [sigma] ⁺g transition of CS₂ in the near ultraviolet

Show full item record

Files in this item

Files Size Format Description   View
UBC_1972_A6_7 M34_5.pdf 6.793Mb Adobe Portable Document Format   View/Open
 
Title: Identification of a ¹Δ [delta] u - ¹Σ [sigma] ⁺g transition of CS₂ in the near ultraviolet
Author: Malm, David Nelson
Degree Master of Science - MSc
Program Chemistry
Copyright Date: 1972
Subject Keywords Absorption spectra.
Abstract: The strongest features in the absorption spectrum of CS₂ in the region 2900Å to 3500Å are identified, from temperature studies, as a π → π* ¹Δu - ¹Σ⁺g transition, where the Renner-Teller effect has split the ¹Δu state into ¹B₂ and ¹A₂ component states of a bent molecule. Analysis of some of the least severely perturbed bands of the ¹B₂ - ¹Σ⁺g transitions (3300 - 2900Å) shows that they form a parallel-polarized progression in the bending vibration, to an upper state with r(C - S) = 1.54₄Å, < SĈS = 163°, and a barrier to linearity of ~ 1400 cm⁻¹. Two hitherto unrecognized progressions of 'hot' bands, a weak vibronic ∏ - ∏ and a stronger vibronic Δ - Δ progression in the region 3300Å to 3500Å, are assigned to the ¹A₂ - ¹Σ⁺g transiton. This is a new type of transition, which does not appear in cold absorption, but whose 'hot' bands can obtain an amount of intensity (proportional to K²) through Renner-Teller mixing.
URI: http://hdl.handle.net/2429/33491
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893