Ionization of two-electron atom in ultrashort laser pulse

The method of numerical integration of the classical equations of motion was used to study interaction of a model two-electron atom with ultrashort laser pulses. Mechanisms and specific features of the ionization process were analyzed in a broad range of laser-field parameters.     

Stability Constants of Zinc and Cadmium Complexes of 2-Hydroxypropene-1,3-Diamine-N,N,N",N"-Tetraacetic Acid

Stability constants of complexes of 2-hydroxypropene-1,3-diamine-N,N,N",N"-tetraacetic acid with Zn²⁺ and Cd²⁺ ions have been determined by potentiometric titration in a KNO₃ supporting electrolyte at 298.15 K and ionic strengths of 0.1, 0.5, and 1.0. The results obtained were extrapolated to the zero ionic strength of the solution using a one-parameter equation.     

Enthalpies of dissolution of NaVO3 · 2H2O in aqueous chloric acid and the standard formation enthalpy of the VO 2 + ion

The enthalpies of dissolution of sodium metavanadate dihydrate in aqueous solutions of chloric acid and sodium perchlorate were measured by calorimetry at 298.15 K at ionic strengths of I = 0.3, 0.4, 0.5, 0.6, and 1.0 M. The standard formation enthalpy of the VO ₂ ⁺ ion in aqueous solution was calculated from the resulting experimental data.     

Enthalpies of the formation and dissolution of D-asparagine monohydrate in water and aqueous solutions of potassium hydroxide

The internal energy of combustion of D-asparagine monohydrate is determined by bomb calorimetry, and its standard enthalpies of combustion and formation in the crystal state are calculated. The enthalpies of dissolution of this compound in water and aqueous solutions of potassium hydroxide are measured by standard calorimetric methods. The standard enthalpies of formation of the amino acid and of the products produced as a result of its protonation and dissociation in an aqueous solution are evaluated.     

Thermodynamics of nickel(II) complexation with 2-hydroxypropylene-1,3-diamine-<Emphasis Type="Italic">N,N, N’, N’</Emphasis>-tetraethanoic acid

Heat effects of formation of nickel(II) hydroxypropylenediaminetetraacetate were determined for the first time at 298.15 K and the ionic strength I = 0.1, 0.5, and 1.0(KNO₃) by the direct calorimetric method. The corresponding standard thermodynamic characteristics of complexation were calculated. The results obtained were compared with published data on related compounds.Translated from Koordinatsionnaya Khimiya, Vol. 30, No. 12, 2004, pp. 943–945.Original Russian Text Copyright © 2004 by Gridchin, Kochergina, Pyreu.     

Enthalpy changes in protolytic equilibria of glycyl-β-alanine in an aqueous solution

Reaction enthalpy changes were measured with the use of calorimetric method for the protonation and neutralization of glycyl-β-alanine at 298.15 K and ionic strengths 0.5, 1.0, 1.5 mol L⁻¹ (KNO₃), and the corresponding standard thermodynamic parameters were evaluated. The results obtained were compared with the literature data on related compounds.     

Thermodynamics of Cobalt(II) Complexation with 2-Hydroxypropylene-1,3-Diamine-N,N,N",N"-Tetraethanoic Acid

The stability constants of cobalt(II) hydroxypropylenediaminetetraacetates at 298.15 K with ionic strength (I) equal to 0.1, 0.5, and 1.0 (KNO₃) are determined using poteniometric and spectrophotometric methods. Heat effects for reactions of complex formation under the same conditions are measured using the direct calorimetric method. The standard thermodynamic parameters of the reactions under study are calculated.     

Thermodynamic characteristics of protolytic equilibria of D,L-alanyl-D,L-leucine in aqueous solution

Previously unknown thermal effects of the stepwise dissociation of D,L-alanyl-D,L-leucine were determined by direct calorimetric measurements. The standard thermodynamic characteristics of the dissociation equilibria were calculated. The results were compared with the published data for related compounds.     

Electroplating of zinc and tin alloys with nickel and cobalt from ammonium oxalate electrolytes

Russian Chemical Bulletin - A possibility of preparing good quality electrolytic alloys zinc-nickel, zinc-cobalt, tin-nickel, and tin-cobalt from ammonium oxalate electrolytes of various...     

Mixed-Ligand Complexation of Zinc and Cobalt(II) Complexonates with Amino Acids in an Aqueous Solution

The formation of mixed-ligand complexes in the M(II)–Nta and Ida–L systems (M = Co, Zn; L = His, Orn, Lys, Gly, Im, en), where Ida and Nta are the residues of iminodiacetic and nitrilotriacetic acids, was studied by pH-metry, calorimetry, and NMR spectroscopy. The thermodynamic parameters (logK, Δ _r G⁰, Δ _r H, Δ _r S) of formation for these complexes were determined at 298.15 K and an ionic strength I = 0.5 (KNO3). The most probable pattern of coordination between a complexone and an amino acid in mixed-ligand complexes was revealed.