Library

Notes: The growth of high quality CdTe epitaxial films on p-InSb(111) by a simple method of temperature gradient vapor transport deposition was carried out to investigate the possibility of the existence of a two-dimensional electron gas with high mobility at CdTe/InSb heterointerfaces. From the x-ray diffraction analysis, the grown layer was found to be a CdTe epitaxial film. Photoluminescence measurements at 15 K showed that a CdTe film grown on InSb(111) in the temperature range between 180 and 280 °C appeared to have an optimum crystal perfection at a substrate temperature of about 245 °C. These results also indicated that the CdTe films grown above 245 °C contained a significant problem due to interdiffusion from the InSb substrates during the growth.

Notes: Results from new laser excitation spectra of 20Ne2 have been combined with previously published experimental and theoretical data to provide a consistent picture describing many of the Rydberg states observed below the first ionization limit. These states are found to fall mainly into Rydberg series converging on the ...3σu X 2Σ+u ground core of Ne+2. Spectral data for the npσ 3Σ+g←a 3Σ+u and npπ 3Πg←a 3Σ+u series support the current assignments of the upper states. Although (0–0) bands dominate these series, other vibronic transitions are observed. The 6–23pσ 3Σ+g–a(0–0) bands are more perturbed than the npπ 3Πg–a(0–0) series; hence, data for 4–17pπ 3Π+g–a(0–0) and 4–6fλ(3Σ+g,3Π+g)–a(0–0) were used to determine a value of 34 409±2 cm−1 for the lowest ionization limit of 20Ne2. Rotational constants for the v=0 levels of 4–17pπ 3Πg and 10–23pσ 3Σ+g also are presented.

Notes: Several Rydberg series attributable to transitions originating from the a 3Σ+u metastable state of the neon dimer have been observed by laser excitation spectroscopy in the afterglow of a pulsed corona discharge. The n=4–9 members of an npπ Πg←a (0–0) series have been rotationally resolved and the upper states characterized. The probable multiplicity of the Πg states is discussed. An unusual loss of intensity in the Q branches for the higher n member transitions and a weak perturbation between the v=1 vibrational level of the 5fσ 3Σ+g state and the 6pπ Πg, v=0 level are also reported.

Notes: Extensive spectra attributable to transitions from the 4sσ a 3Σ+ metastable state of Ar2 to excited Rydberg states have been observed by intracavity absorption spectroscopy and by laser excitation spectroscopy in the afterglow of a pulsed corona discharge. Of these the most extensive and best resolved were the laser induced fluorescence spectra. Most of the spectra can be assigned to vibronic transitions in the nfλ (3Πg,3Σ+g) and npλ (3Πg,3Σ+g)←a 3Σ+u series. The 5pπ3Πg←a 3Σ+u and 7pσ 3Σ+g←a 3Σ+u transitions observed near 19 823 and 19 529 cm−1, respectively, exhibit many bands with v'≠0 in their (v'–v‘) vibrational band system developments. The higher n value members of these and other observed series are dominated by (0–0) transitions. Rotational structure is partially resolved in a few bands of the 7pσ 3Σ+g–a system, but most of the spectra observed appear to be either rotationally unresolved or made up of blended collections of rotational lines. Above the 7pσ, 5pπ pair, the (n+2)pσ 3Σ+g and npπ 3Πg members of the npλ series rapidly coalesce, indicating a rapid onset of decoupling of the electronic orbital angular momentum, Lˆ, from the internuclear axis.Such decoupling leads to np-complex formation at n values much lower than observed in the npλ series of the lighter dimers: He2 and Ne2. From the data for the observed series, the lowest ionization limit of Ar2 (relative to a 3Σ+u,v=0 ) was determined to be 29 373±3 cm−1. Vibrational intervals ΔG(v+1/2) for a 3Σ+u(v≤4) and 7pσ 3Σ+g(v≤2) yield the vibrational constants ωe=296 and 282 cm−1 and xωe=2.5 and 17 cm−1, respectively.

Notes: Rotationally resolved, laser-induced fluorescence spectra for the transitions nf (3Σ+g,3Πg) ←a 3Σ+u (n=4–6) in Ne2 are presented and analyzed. The rotational structures of the upper states are found to be strongly l-uncoupled. Effective rotational constants for the a 3Σ+u, nfσ 3Σ+u, and nfπ 3Π±u states with n=4–6 are reported and the structures of the nf complexes discussed.

Notes: White electroluminescence (EL) was observed for the first time from diamond-like carbon (DLC) films at room temperature. ac voltages in excess of 200 V were applied to a metal-insulator-semiconductor (i.e., DLC)-insulator-metal device structure to observe EL. At an applied voltage of 235 V, the brightness and efficiency were 0.5 fl and 0.002 lm/W, respectively.

Notes: A plasma fluctuation signal analysis software package is described that surmounts common difficulties by using an information-hiding method and a layered structure.This approach leads to portability and easy customization for experimentalists who are not necessarily experts in signal analysis. The software contents and examples of applications to actual experimental data will be discussed.

Notes: The objective of this paper is to present a systematic comparison of the conventional fast Fourier transform and maximum entropy method (MEM) of spectral estimation of turbulent plasma fluctuation data. On the basis of this comparison, it appears that the MEM is the preferred approach for the spectral analysis of short time duration fluctuation records.

Notes: Rotationally resolved transitions from the metastable 4sσ a3Σ+u state of Ar2 to the 7pσ 3Σ+g state have been observed by laser excitation spectroscopy in a pulsed corona discharge. Laser induced fluorescence spectra for the 7pσ 3Σ+g←a3Σ+u transition observed near 19 530 cm−1 have led to the first resolved triplet splittings and rotational analyses for Rydberg–Rydberg transitions in Ar2. Analyses for the (0–0), (0–1), (1–0), and (1–1) bands of 7pσ←a are presented here. Bands with v'=2 are observed for this system but exhibit no rotational structure and bands with v'(approximately-greater-than)2 are not observed, indicating that the predissociation lifetimes of these upper levels fall rapidly for v'(approximately-greater-than)1. Data presented lead to rotational energies and molecular constants for the a3Σ+u and 7pσ 3Σ+g states, including the effective rotational constant Be which is determined to be 0.1412 cm−1 and 0.1345 cm−1 for the 4sσ a3Σ+u and 7pσ 3Σ+g states, respectively. Results are compared to ab initio and other calculations, and combined with existing data to produce experimental estimates of D0 and De for the a3Σ+u state of 5700±200 cm−1 and 5850±200 cm−1, respectively.

Notes: Abstract The Kyokpori Formation (Cretaceous), south-west Korea, represents a small-scale lacustrine strike-slip basin and consists of an ≈ 290 m thick siliciclastic succession with abundant volcaniclasts. The succession can be organized into eight facies associations representing distinctive depositional environments: (I) subaqueous talus; (II) delta plain; (III) steep-gradient large-scale delta slope; (IV) base of delta slope to prodelta; (V) small-scale nested Gilbert-type delta; (VI) small-scale delta-lobe system; (VII) subaqueous fan; and (VIII) basin plain. Facies associations I, III and IV together constitute a large-scale steep-sloped delta system. Correlation of the sedimentary succession indicates that the formation comprises two depositional sequences: the lower coarsening- to fining-upward succession (up to 215 m thick) and the upper fining-upward succession (up to 75 m thick). Based on facies distribution, architecture and correlation of depositional sequences, three stages of basin evolution are reconstructed. Stage 1 is represented by thick coarse-grained deposits in the lower succession that form subaqueous breccia talus and steep-sloped gravelly delta systems along the northern and southern basin margins, respectively, and a sandy subaqueous fan system inside the basin, abutting against a basement high. This asymmetric facies distribution suggests a half-graben structure for the basin, and the thick accumulation of coarse-grained deposits most likely reflects rapid subsidence of the basin floor during the transtensional opening of the basin. Stage 2 is marked by sandy black shale deposits in the upper part of the lower succession. The black shale is readily correlated across the basin margins, indicating a basinwide transgression probably resulting from large-scale dip slip suppressing the lateral slip component on basin-bounding faults. Stage 3 is characterized by gravelly delta-lobe deposits in the upper succession that are smaller in dimension and located more basinward than the deposits of marginal systems of the lower succession. This lakeward shift of depocentre suggests a loss of accommodation in the basin margins and quiescence of fault movements. This basin evolution model suggests that the rate of dip-slip displacement on basin-margin faults can be regarded as the prime control for determining stacking patterns of such basin fills. The resultant basinwide fining-upward sequences deviate from the coarsening-upward cycles of other transtensional basins and reveal the variety of stratigraphic architecture in strike-slip basins controlled by the changes in relative sense and magnitude of fault movements at the basin margins.