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1.
Russ J Gen Chem ; 92(11): 2500-2506, 2022.
Article in English | MEDLINE | ID: mdl-36532258

ABSTRACT

Based on six representatives of 2-oxonicotinonitriles, the effect of the nature of the substituent in the fourth position of the pyridine system on the photophysical characteristics was studied. The role of the donor/acceptor nature of the substituent and the solvent nature in the absorbing and fluorescent properties of the compounds was shown.

2.
Spectrochim Acta A Mol Biomol Spectrosc ; 60(14): 3337-40, 2004 Dec.
Article in English | MEDLINE | ID: mdl-15561617

ABSTRACT

This paper deals with the development of a novel single-frequency tunable diode laser with fiber-optic output for gas-analysis applications. The approach we propose is a convenient, simple and cheap solution for spectroscopy of single absorption lines of any gases having absorption bands in the optical fiber transparency window (0.7 microm/1.7 microm). The presence of fiber-optic output is an additional advantage for remote sensing applications. The laser operation is demonstrated as applied to R7 line of 2 nu(3) methane absorption band at lambda = 1.645 microm. The mode-hop-free tuning range of 35 GHz (1.2 cm(-1)) has been achieved.


Subject(s)
Lasers , Methane/analysis , Spectrum Analysis/instrumentation
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