Lowest Overtone and Combination Levels of DCCI: The Fermi Resonance v3 = 1/v5 = 2.
The infrared spectrum of deuterated monoiodoacetylene DCCI in the region of 220-550 cm-1 has been studied at a resolution of 0.0020 cm-1. The hot bands nu3 <-- nu15 and 2nu0,25 <-- nu15 have been analyzed by considering especially the Fermi resonance v3 = 1/v5 = 2. In the next layer of the hot bands (nu3 + nu5)1 <-- nu3, (nu3 + nu5)1 <-- 2nu0,25 and 3nu1,35 <-- 2nu25 the same Fermi resonance appears between v3 = v5 = 1 and v5 = 3. In addition, various l resonances at the overtone levels have been considered. As a result, the vibrational and rotational constants for the level systems v3 = 1/v5 = 2 and v3 = v5 = 1/v5 = 3 together with the resonance parameters have been obtained. Copyright 1999 Academic Press.
Hot bands in the region of the v 5 band of HCCI: the Fermi resonance v 3 = 1/v 5 = 2
The Fourier transform infrared spectrum of monoiodoacetylene, HCCI, between 180 cm-1 and 320 cm-1 has been studied at a resolution of 0·0010 cm-1. The hot bands, v 3 ← v 1 5, 2v 0 5 ← v 1 5 and 2v 2 5 ← v 1 5, associated with the v 5 fundamental have been analysed by considering especially the Fermi resonance between the levels v 3 = 1 and v 5 = 2. The next layer of the hot bands, (v 3 + v 5)1 ← v 3, (v 3 + v 5)1 ← 2v 0, 2 5, and 3v 1, 3 5 ← 2v 0, 2 5, has been analysed by taking into account the Fermi resonance between the levels v 3 = v 5 = 1 and v 5 = 3. Also the various l responances at the overtone levels have been considered. As a result, the vibrational and rotational constants and the resonance parameters for the vibrational levels investigated have been obtained.
Cooperative Collection Development
The author discusses cooperative collection development from an historical perspective and examines some of the projects conceived and implemented during the past forty years. In many cases the projects failed even after years of concentrated effort. However, more important than these failures are new efforts that are being made. The major focus of this article is on both current regional projects and the more broadly based ARL-sponsored North American Collections Inventory Project. The author discusses these efforts and offers some specific judgments regarding the possibility that these projects will lead to a truly successful coordinated collection development project on a national basis.