Sh. Sh. Nabiev

Infrared spectroscopy of fluoride molecules in noble gas solutions. I: Octahedral molecules

Infrared spectra of the spherical top molecules XF6 (X = S, U, Mo, W) dissolved in liquefied argon, krypton and xenon have been studied. It is shown that the observed Lorentz shape of the bands results from two processes: vibrational dephasing and rotational diffusion. In contrast to fundamental transitions A1g - F1u, for the (v 2 + v 3) state it has proved necessary to apply two limiting cases: when the anharmonic level splitting ΔE anh is much greater than the Coriolis coupling, and when ΔE anh is small relative to the Coriolis coupling. Measured values of band halfwidths are compared with the theoretical values, obtained with the help of a rotational diffusion model. It is concluded that, in contrast to SF6, vibrational dephasing and intermolecular interactions contribute essentially to the formation of band contours of heavy metal hexafluorides. The second moment for the (v 2 + v 3) band has been estimated. The characteristic times of angular momentum correlation for SF6, UF6, MoF6 and WF6 molecules i...

Analysis of the products of the natural decay of high explosives by subterahertz and infrared Fourier spectroscopy

Infrared Fourier spectra and spectra in the range of subterahertz frequencies (sub-THz) for the vapor phase over solid samples of high explosives (technical trinitrotoluene, nitroglycerine, and hexogen) were studied experimentally. The results from identifying products of the natural decay of high explosives by infrared Fourier and sub-THz spectroscopy are compared.

Raman study of molecular dynamics of inorganic fluoroxidizers in nonaqueous solutions—Part 1. Xenon difluoride in acetonitrile

Abstract The Raman spectra of the totally symmetric ν 1 (Σ g + ) mode of XeF 2 molecules have been measured in CH 3 CN solutions at various temperatures and concentrations. The vibrational and rotational correlation functions as well as the characteristics times have been calculated. It was concluded that the vibrational band width in these solutions is to be attributed to the vibrational dephasing, whereas the contribution from the rotational relaxation has been found to be of less importance.

Vibrational spectra of phosphine and arsine in the gas phase, the liquid phase, and in the solution of liquefied argon

Abstract The IR spectra of phosphine and arsine in the gas phase, in the liquid phase and in liquefied argon solution have been investigated (spectral range 400–5700 cm −1 ). The vibrational frequencies and the integrated absorption coefficients of the fundamental and overtone bands have been measured. The possibility of self-association of the hydrides in the liquid phase is discussed.

Spectrochemical properties of some explosives in the vapor state

The FTIR spectra of 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and pentaerythritol tetranitrate (PETN) in the vapor phase over wide frequency (3500–500 cm−1) and temperature ranges (293–383 K) is experimentally studied and the assignment of the observed vibrational bands is performed. To clarify the nature of the physicochemical processes that occur during the heating and evaporation of RDX and PETN and to detect and identify their characteristic components, the mass spectra and sub-THz spectra of these explosives are studied. To obtain spectroscopic information, special experimental techniques for recording of IR, sub-THz, and mass spectra of vapors of explosives and for preparation of high-purity RDX and PETN samples (with a main substance content of >99.7%) are developed based on modern methods of synthesis and purification.

Raman study of molecular dynamics of inorganic fluoroxidizers in nonaqueous solutions: part 4. Xenon tetrafluoride and xenon hexafluoride in hydrogen fluoride.

Raman spectra of XeF4 and XeF6 in the nonaqueous HF solutions at various concentrations and vibrational spectra of the [XeF5]+ cation in the solid state and in the HF solutions over a wide range of vibrational frequencies have been studied. The assignments of the observed vibrational bands of the [XeF5]+ cation and XeF6-HF system has been made. A number of associates or solvates being formed as a result of the donor-acceptor interaction between Lewis base and Lewis acid has been shown to exist alongside with ionized monomeric and polymeric modifications of XeF6 in the HF solution such as ([XeF5]+ F-)n (n = 1, 2, 4). The contours of the nu1(A1g) band of XeF4 with frequency 552 cm(-1) and bands of stretching modes of ([XeF5]+ F-)n (n = 1, 2, 4) with frequency in the range of 600-670 cm(-1) are analysed. The correlation functions of the vibrational and rotational relaxation as well as the corresponding characteristic time for these processes have been calculated. A conclusion has been driven at that it is vibrational dephasing that makes the major contribution to the formation of ([XeF5]+ F)4 and ([XeF5]+ F-)2 band contours, while in the case of [XeF5]+ F- and XeF4 the contributions of vibrational dephasing and rotational relaxation nearly coincide.

Structure of simple and complex noble gas fluorides

The structural parameters of simple and complex fluorides of noble gases in different aggregate states have been analyzed. The data on their molecular and crystal structure are reported. The structural features of simple, coordination, polymer, and clathrate-like compounds of krypton and xenon fluorides are considered

Express analysis of water isotopomers in the atmosphere with the use of nonstationary subterahertz and terahertz spectroscopy methods

Preliminary results of investigation of the possibility of developing the method of air express analysis for detecting the isotope composition of atmospheric water vapors with the use of subterahertz and terahertz nonstationary spectroscopy methods are presented. Particular attention is paid to the real time detection of the background and minimally detectable concentrations of heavy water vapors in the atmosphere.

Subterahertz and mid IR spectroscopy of explosive substances

The present work reports on detection of explosives substances (NG, TNT, RDX) in subTHz and midIR, based on registration of certain marker-molecules evaporated from surfaces of samples. Experimental results of both methods are in good agreement and have demonstrated a presence of nitric oxides, ammonia, acetone, etc in explosives vapors.

“Clathrates” (?) of noble-gas fluorides

Abstract Reactions between gold pentafluoride and alkali-earth metals fluorides in non-aqueous hydrogen fluoride were investigated. Ca(AuF 6 ) 2 , Sr(AuF 6 ) 2 and Ba(AuF 6 ) 2 were identified. The Raman spectra of the received compounds were examined in crystalline form and in the non-aqueous HF solution. It was found out, that bis-hexafluoroaurates had high solubility in non-aqueous HF. The Raman spectra of liquid system HFM II (AuF 6 )KrF 2 were investigated. The compounds of variable composition on KrF 2 , where n=1+4 (Ba, Sr) and n=1+3 (Ca) were crystallized from this system, if the solvent were evaporated slowly. The results of Raman spectra analyses of obtained compounds are presented. Interaction between KrF 2 and M II (AuF 6 ) 2 leads to essential increase of vibrational frequency of KrF bond (up to 35 cm −1 ) comparing with KrF 2 (462 cm −1 ) and to the splitting of vibrational bond. This interaction decreases with increase of n; the possible nature of interaction is discussed. The received compounds are characterized by higher thermal stability of the “bonded” KrF 2 . If heated up to 350 K KrF 2 may be quantatively obtained from the salts. If heated quickly up to 370+380 K the salts decomposes with explosion. The energy aspect of the complex salts formation is discussed. The results of interaction between M II (AuF 6 ) 2 and xenon fluorides will be also presented.