Rotational Structure in the Spectra of Diatomic Molecules.

Abstract

Rotational structure in the spectra of diatomic molecules Автор(ы): Kovacs I. Год изд.: 1969 Описание: It is mainly since the early 1920's that the rotational spectra of diatomic molecules have been investigated. During this time it has become clear how deeply rooted are the connections between these spectra and the internal structure of the molecules and how important is the information they give about molecular architecture. It has become evident that these spectra are, say, coded messages from the molecules in secret writing and that to decipher these messages it is necessary to determine experimentally the position and intensity of the spectral lines and to establish the theoretical laws governing the spectra. Although the fundamental investigations about rotational spectra were published in the third and fourth decades of this century and the fundamental theory can be found in a number of excellent books, it seems appropriate and necessary to collate this material in the form of a unified system and to complete this system by adding new elements. This is especially true with respect to the formulas of intensity distribution, a systematic collection of which is in growing demand by physicists and astronomers. The author's aim is to meet this demand by the present book. It is the writer's hope that the present book will be useful to both theoretical and experimental research workers who want complete and unified information concerning the rotational structure in spectra.

Branching Ratio Measurements for Vacuum Ultraviolet Photodissociation of 12C16O

“…The first order perturbation between a 3 Σ − state and a 1 Σ + state is independent of J′; 33 the perturbation between a 3 Σ − state and a 1 Π state is nonlinearly dependent on J′. 33 Neither of the above two phenomena has been observed; thus, it is more likely that the 3 3 Π valence state is playing an important role in the predissociation process into the triplet channel. Direct coupling between a 3 Π state and 1 Σ + does not depend on J′ in Hund case (a) and not linearly on J′(J′ + 1) in case (b); 33 33,34 and the spin−orbit coupling between a 1 Π state and a 3 Π state is independent of the rotational quantum number J′.…”

“…33 Neither of the above two phenomena has been observed; thus, it is more likely that the 3 3 Π valence state is playing an important role in the predissociation process into the triplet channel. Direct coupling between a 3 Π state and 1 Σ + does not depend on J′ in Hund case (a) and not linearly on J′(J′ + 1) in case (b); 33 33,34 and the spin−orbit coupling between a 1 Π state and a 3 Π state is independent of the rotational quantum number J′. 33 On the basis of the discussion thus far, we propose a predissociation mechanism that has a coupling scheme of 1 Σ + − 1 Π− 3 Π for the predissociation of the K(4pσ) 1 Σ + (v′ = 0) state into the triplet channel.…”

“…For a 1 Π− 1 Σ + heterogeneous interaction, the predissociation rate constant is expected to be linearly dependent on J′(J′ + 1), where J′ is the rotational quantum number of the excited vibronic state. 33,34 If this happens in the predissociation process into the triplet channels, then the branching ratio can be rewritten as…”

Rotational and gas temperatures of molecular deuterium in a hollow cathode glow discharge

“…Since the degenerated d 3 Π + u state interacts strongly with the e 3 Σ + g state, the P-and R-branches of Fulcher-α are perturbed and relative transition probabilities for these lines differ from the Hönl-London factors [25][26]. Therefore, we used Q-branches from the d 3 Π − u state.…”

Determination of the spectroscopic properties of indium bromide

“…Here, features of the Indium-Bromide spectrum will be discussed [15], [16], [17], [18], [19]. The ground state of InBr is a 1 Σ + 0 state.…”