Application of matrix isolation spectroscopy to quantitative sputtering studies. I. Energies and oscillator strengths of the resonance transitions of gold atoms isolated in noble gas matrices

Abstract

Articles you may be interested inDirect comparative study on the energy level alignments in unoccupied/occupied states of organic semiconductor/electrode interface by constructing in-situ photoemission spectroscopy and Ar gas cluster ion beam sputtering integrated analysis system A molecular dynamics study of the transport coefficients of liquid transition and noble metals using effective pair potentials obtained from the embedded atom model Matrix isolation spectroscopy has been applied to quantitative sputtering studies by developing techniques for the codeposition of backsputtered metal atoms with a large excess of noble gas atoms, The electronic spectra of Au atoms, produced by bombardment of an Au target with 50 keY Ar+ ions, were studied in Ar, Kr, and Xe matrices. Energy level shifts of the Au resonance doublet due to matrix perturbations have been interpreted in terms of changes in the spin-orbit coupling interaction of the Au 6p electron. The values in the various matrices were found to be {x, = 2570 cm-I ; {K, = 2943 em-I; {A< = 3215 cm-I ({gas = 2543 cm-I ). The N 650 em-I splitting of the 2 P 3/2 state in the various matrices was interpreted in terms of an axial distortion of a dodecahedral substitutional site. Simultaneous diagonalization of spin-orbit and "crystal" field interactions was employed to obtain { and A 2 splitting parameters. Oscillator strengths for the resonance transitions were determined by developing an equation which relates the sputtering yield, integrated current, and a geometric factor based on a cosine law distribution of sputtered atoms to the integrated absorbance over an absorption band and the area sampled by the spectrometer beam. Oscillator strengths for the 2 P 112 and 2 P 3/2 transitions were found to be 0.132, 0.293 in Ar; 0.090, 0.200 in Kr; and 0.061, 0.145 in Xe. By comparison the gaseous atom values ("hook" method) are 0.19, 0.41. It is pointed out that the matrix isolation method can determine Au atom concentrations equivalent to 0.1 monolayer and is therefore among the more sensitive and rapid techniques for measuring sputtering yields.Very frequently, both atomic and molecular products are formed simultaneously in the sputtering process, ~ and in order to determine the relative yields of these products, oscillator strengths and infrared transition intensities in matrices have to be determined. For sput-

Optical Properties of Gold Atoms in γ-Irradiated Organic Solid Solutions at 77 K

“…These lines are assigned to the transition from Au 0 (5d 10 6s, 2S 1/2 ) to Au 0 *(5d 10 6p, 2P 1/2 ) and Au 0 *(5d 10 6p, 2P 3/2 ). The absorption band of 260−280 nm observed in this study was closer to those lines in solid cyclohexane 11 matrix rather than in solid argon matrix . On the basis of the ESR evidence of formation of Au 0 in our previous study, together with the spectral analogy to the previous results of the optical absorption of Ag 0 or Cu 0 in the solutions including Ag + or Cu + ions at 77 K, , we attribute the difference spectra to the absorption bands of Au 0 formed in the solutions at 77 K. These bands are red-shifted and broadened compared to those in rare gas matrixes, indicating a strong solvent−Au 0 interaction.…”

“…The increase in the intensities of the emission peaks at 450−520 nm in question during storage at 77 K can be confirmed clearly in the case of λ exc = 390 and 410 nm, as shown in Figure A (4) and (5), respectively. It is noted that the spectral profile of the emission bands in the region of 450−520 nm looks like a mirror image of the absorption spectra of Au 0 in the rare gas matrix . If this is the case, the emission bands can be attributed to Au 0 * trapped in a large cavity where Au 0 scarcely interacts with solvent molecules.…”

“…The solid lines represent the difference spectra. The stick diagrams are the absorption lines due to Au 0 deposited directly in solid argon (C) (ref ) and cyclohexane (D) (ref ) matrixes at 10−15 K. …”

“…Especially, the atoms in the gas phase at low temperatures are isolated from electrostatic fields of neighboring ions, atoms, or gas molecules, so that their energy levels and various physicochemical properties have been well established and systematically published − On the other hand, except for the case of silver atoms at low temperatures as reported previously, − few studies have been carried out for other 1B metal atoms to elucidate the solute−solute or solute−solvent interactions which are induced by the atoms or ions surrounded by water or organic molecules. Many problems involving the optical properties of the atoms or ions in these environments remain unsolved, especially for the case of the gold atom.…”

Efficient Luminescence Enhancement of Mg2TiO4:Mn4+ Red Phosphor by Incorporating Plasmonic Ag@SiO2 Nanoparticles

“…It can be so that a part of silver ions or their clusters penetrated from the surface of silver nanoparticles inside the host and become more close to Mn 4+ ions. Silver clusters have such specific light absorption peaks in the ultraviolet spectral range: Ag 2 (275, 278,389 nm), Ag 3 (222, 232, 246, 422 nm), Ag 4 (286 nm), and Ag 5 (349, 476 nm). , Because these peaks are overlapped with Mn 4+ absorption, it can be the possibility for energy transfer from Ag clusters sensitizing Mn 4+ fluorescence. The possibility of such sensitization was reported previously for the case of optical glasses activated by rare-earth ions …”