Skip to main content
main-content

Über dieses Buch

Nitrogen dioxide (N0 ) is notorious for its complex visible spectrum and has 2 frustrated many chemists and physicists. Despite their intense investigations the molecule still resists complete analysis of its spectrum. Because of the high density of lines, it is apparent that high-resolution measurements are essential to a thorough understanding of the spectrum. The major part of this book consists of an atlas, described in Chap. 2, of the absorption spectrum and the Stark modulation spectrum of N0 mea­ 2 sured using a cw dye laser. The narrow spectral width as well as the wide scan range of the dye laser made it possible to record the spectra contin­ uously over a wide range with Doppler-limited resolution. In the spectral range 16751-17885 em-I, about 13300 peaks have been observed in the absorption spectrum and their wave numbers, calibrated against Ar lines, are listed in the tables. The Stark modulation spectrum also shown provides useful information about the energy level structures complementary to that obtained from the absorption spectrum.

Inhaltsverzeichnis

Frontmatter

1. Introduction

Abstract
Nitrogen dioxide (NO2) shows a much more complicated visible absorption spectrum than expected for a triatomic molecule. Fine structure due to the spin S = 1/2 of the unpaired electron, hyperfine structure due to the nuclear spin I = 1 of the 14N atom, and overlapping of the excited electronic states are obviously among the causes of its complexity. In addition, it has been found that the coupling between the electronic states through various perturbation mechanisms plays an important role in its irregular spectrum. Quite a few researchers have challenged the complicated spectrum hoping for better understanding of the physics of this frustrating molecule. Despite their efforts, most portions of the spectrum remain to be analyzed.
Kiyoji Uehara, Hiroyuki Sasada

2. High Resolution Spectral Atlas of NO2 Between 559 and 597 nm

Abstract
The spectral atlas following Chap. 4 consists of the absorption spectrum and the Stark modulation spectrum of NO2, divided into 179 charts, along with the wave-number tables of the observed absorption peaks. The cw dye laser used as a light source had a very narrow spectral width, so that the observed spectra are essentially Doppler-limited. Argon absorption lines were used for wave-number calibration. The spectral interval covered by the measurements is 559–597 nm (16751–17885 cm−1), which is the major part of the tuning range of a Rhodamine 6G dye laser. Each of the 179 sets of traces was recorded in a single scan over a frequency range of ≌ 7 cm−1. The total number of peaks listed in the tables is about 13 300.
Kiyoji Uehara, Hiroyuki Sasada

3. Progress in Spectroscopic Studies of NO2 Using Lasers

Abstract
In this chapter, recent spectroscopic studies of NO2 using lasers are briefly reviewed. Details of various techniques of laser spectroscopy are described, for example, in a book by Demtröder [3.1]. Current topics of laser spectroscopy are found in the Proceedings of the International Conferences on Laser Spectroscopy [3.2,3]. A selected bibliography of recent studies, including non-laser experiments and theoretical work, is given in Chap. 4.
Kiyoji Uehara, Hiroyuki Sasada

4. Selected Bibliography 1978–1983

Abstract
This chapter presents a list of literature of spectroscopic studies on the NO2 molecule which were published between 1978 and the beginning of 1984. The list has about 130 selected papers, including those reporting non-laser experiments and theoretical work which were not referred to in Chap. 3. All papers are given with full titles. The papers were searched for mainly through the CAS Database. A compilation of earlier work before 1978 was given by Hsu et al. [4.1].
Kiyoji Uehara, Hiroyuki Sasada

Atlas of Absorption and Stark Modulation Spectra

Without Abstract
Kiyoji Uehara, Hiroyuki Sasada

Backmatter

Weitere Informationen