Optical Spectroscopy and the Structure of Polyfunctional Hydrocarbon Compounds and Oil Products

• Published in: Optics and spectroscopy Vol. 124; no. 5; pp. 696 - 702
• Main Author: Obukhov, A. E.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.05.2018; Springer Nature B.V
• Subjects: ABSORPTION SPECTRA; Additives; Chemical composition; COMBUSTION; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed-Matter Spectroscopy; Deactivation; ELECTRONIC STRUCTURE; Excitation; EXCITED STATES; Heterocyclic compounds; HYDROCARBONS; INTERACTIONS; IONIZATION; Lasers; Light emission; Lubricants; LUMINESCENCE; OILS; Optical Devices; Optical properties; Optical pumping; Optics; Organic chemistry; OSCILLATORS; Oxidation; PARAMAGNETISM; Photolysis; Photonics; Physics; Physics and Astronomy; PULSES; Quantum chemistry; RECOMBINATION; SPECTROSCOPY; Spectrum analysis; ULTRAVIOLET RADIATION; VISIBLE RADIATION
• ISSN: 0030-400X; 1562-6911
• DOI: 10.1134/S0030400X18050168

The optical and physicochemical properties associated with the change (oxidation, thermolysis and photolysis), during the operation, of the spatial and electronic structures of the polyfunctional hydrocarbon compounds, oils, oil products, and N-, O-, and S-containing heteroaromatic compounds and additives, which comprise a variety of fuel and lubricant compositions involved in the structural and phase rearrangements, as well as in the formation of colloidal and micelle aggregates altering the structure with respect to their hydrocarbon, chemical, and fractional compositions, are investigated. The spectroscopic-luminescent properties of the compounds and their ion-radical forms were studied using optical and spectroscopic methods and quantum-chemical calculations when the excitation energy in the full spectra of singlet and triplet (for the ion, quartet and doublet) electronic excited states was deactivated. Intramolecular mechanisms of the hyperfine electron–nucleus interaction between the active groups of quasi-oscillators in the structure of polyfunctional compounds in the paramagnetic states of hydrocarbons, which form the electronic structure of the triplet–triplet transitions induced by pumping in the optical absorption spectra, are studied. It is shown that the mechanism of multistep ionization, fragmentation, and appearance of radicals and the electronic-vibrational mechanism of an increase in the vibration temperature up to T = 6000–7000 K are developed during the action of the ultraviolet (UV) pumping pulse of a nanosecond duration until the light emission, which gives rise to thermolysis and recombination that create the conditions for the combustion and explosion when the excitation energy is localized on a limited number of groups of quasi-oscillators in the structure.