The ultraviolet spectrum of AlO

1981 ◽  
Vol 59 (7) ◽  
pp. 955-966 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Spectral Region ◽  
High Frequency ◽  
Ultraviolet Spectrum ◽  
Rotational Structure ◽  
Ultraviolet Region ◽  
High Frequency Discharge ◽  
Rotational Perturbation ◽  
First Time

The E2Δi–A2Πi transition of AlO in the ultraviolet region has been excited in a high frequency discharge through a flowing mixture of AlCl3 vapour, argon, and oxygen and photographed at high resolution. The 0–0 and 0–1 bands of this transition at 2500.1 and 2545.9 Å respectively have been analysed for the rotational structure. Rotational perturbations and predissociation have been observed in the E2Δi state. Λ-doubling has been observed in both the bands for the transition E2Δ3/2–A2Π1/2. A weak rotational perturbation has been detected in the ν = 1 level of the A2Π3/2 state. In the same spectral region the 1–1, 2–2, 3–3 bands (observed for the first time) and the 1–2 band of the D2Σ+–X2Σ+ system have also been recorded and analysed for their rotational structure.

A Discussion on solar studies with special reference to space observations - A high resolution solar ultraviolet spectrum between 200 and 220 nm

1971 ◽  
Vol 270 (1202) ◽  
pp. 29-46 ◽  
Keyword(s):  
High Resolution ◽  
Solar Spectrum ◽  
Ultraviolet Spectrum ◽  
Absorption Feature ◽  
Intensity Analysis ◽  
Echelle Spectrograph ◽  
Broad Absorption ◽  
First Time ◽  
Solar Ultraviolet ◽  
The Continuum

A high resolution solar spectrum in the range 200 to 220 nm has been recorded with an echelle spectrograph launched in, a sun-pointing Skylark rocket. The data have been reduced and are presented as intensity-wavelength plots together with a wavelength list and proposed identifications. A broad absorption feature at 212.4 nm is assigned to a single source and an intensity analysis confirms this to be the non-resonance Sii line at 212.412 nm. The discontinuity in the continuum intensity near 208.7 nm is revealed with high resolution for the first time and is assigned to the photoionization edge of A11. An analysis shows that its intensity drop and wavelength position can only be explained by adjustments to the solar model in the region 0.001 < T 5000 < 0.2.

The A2Π–X2Σ+ system of MgCl

1987 ◽  
Vol 65 (12) ◽  
pp. 1594-1603 ◽  
Author(s):  
M. Singh ◽  
G. S. Ghodgaonkar ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Structure Analysis ◽  
Vibrational Level ◽  
High Frequency ◽  
Low Frequency ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
The Common ◽  
Π State

The A2Π–X2Σ+ system of MgCl has been photographed at high resolution and analyzed for the rotational structure. Analysis of the low-frequency sub-bands of the 0–0, 0–1, and 0–2 bands showed that there is a nonzero Λ doubling in the common vibrational level ν′ = 0, thereby indicating that the A2Π state is regular and not inverted as presumed by earlier workers. Spin-doubling has been seen in the ν = 1 and 2 levels of the X2Σ+ state. Rotational analysis of the high-frequency sub-band has also been done for the 0–0 band.

C2Πr – X2Σ+ transition of AlO

1983 ◽  
Vol 61 (9) ◽  
pp. 1347-1358 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Rotational Structure ◽  
Rotational Constants ◽  
First Time ◽  
Π State

Several bands of the C2Πr – X2Σ+transition of AlO in the region 2800–3400 Å have been photographed at high resolution. A unique and unambiguous analysis of the rotational structure has been done for the first time for the 2–0, 1–0, 2–1, 0–0, 1–1, 0–1, 1–2, and 0–2 bands of this system. Fairly accurate rotational constants Beff and Deff have been determined for the ν = 2, 1, and 0 levels of the C2Πr state. Severe rotational perturbations have been observed in the C2Π, state.Equilibrium rotational constants (in cm−1) of the C2Π, state are Be ≈ 0.6049 and αe ≈ 0.0046.

Non-invasive high-resolution acoustic microscopy technique using embedded nanostructures

2007 ◽  
Vol 1019 ◽  
Author(s):  
Daniel Wulin ◽  
Shriram Ramanathan
Keyword(s):  
High Resolution ◽  
Acoustic Waves ◽  
High Frequency ◽  
Acoustic Microscopy ◽  
Biological Applications ◽  
Acoustic Oscillations ◽  
Non Invasive ◽  
Microscopy Technique ◽  
First Time

AbstractAn opto-acoustic system capable of operating at frequencies greater than 1 GHz with novel biological applications is proposed for the first time. Metallic spheres with radii on the order of hundreds of nanometers dispersed inside a bio-matrix can be used to generate in-situ ultra-high frequency acoustic waves whose normal mode frequencies can be calculated using Lamb's theory for acoustic oscillations of elastic spheres. The frequency and amplitude of the resulting acoustic waves can be related to the physical properties of the metallic spheres and the surrounding bio-matrix: the acoustic waves produced by the metallic spheres are well-suited to high resolution acoustic imaging. We anticipate that our approach will open up new nanoscale techniques to study cells non-invasively.

A new electronic transition C2πr–A2πi, of AlO

1982 ◽  
Vol 60 (12) ◽  
pp. 1730-1742 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Electronic Transition ◽  
High Frequency ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
High Frequency Discharge

Several weak bands of AlO, degraded to the violet and occurring as wide doublets 200 cm−1 apart, have been observed in the region 3300–4000 Å, in emission from a high frequency discharge through a flowing mixture of AlCl3 vapour, oxygen, and argon. These bands have been identified as due to a new electronic transition C2πr–A2πi of AlO. This has been confirmed from a detailed rotational analysis of the 1–0 and 0–1 bands (heads, respectively, at 3481.92, 3506.09 Å and 3683.30, 3710.98 Å) from high resolution spectra. Numerous rotational perturbations have been found in both the C2π3/2 and C2π1/2 substates. Effective rotational constants have been determined for these substates. Λ-doubling has been observed even in the substate C2π3/2.

The D2Σ+ – A2Πi and C2Πr – A2Πi transitions of AlO

1985 ◽  
Vol 63 (9) ◽  
pp. 1162-1172 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Electronic State ◽  
Rotational Structure ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Lower Electronic State ◽  
The Common ◽  
First Time

Several bands of the D2Σ+ – A2Πi and C2Πr – A2Πi transitions of AlO have been photographed at high resolution and analyzed for the rotational structure. Rotational structure in the vibrational levels ν = 0, 1, 2, 3, and 4 of the common lower electronic state A2Πi has been investigated for the first time. Rotational perturbations have been observed in the A2Πi state. The equilibrium rotational constants of the A2Πi state are Be = 0.53705 cm−1 and αe = 0.00491 cm−1.

scholarly journals Спектр высокого разрешения полос ν-=SUB=-2-=/SUB=-+ν-=SUB=-4-=/SUB=- (F-=SUB=-1-=/SUB=-,F-=SUB=-2-=/SUB=-) и 2ν-=SUB=-4-=/SUB=- (F-=SUB=-2-=/SUB=-) дейтерированного силана -=SUP=-28-=/SUP=-SiD-=SUB=-4-=/SUB=-

2021 ◽  
Vol 129 (9) ◽  
pp. 1122
Author(s):  
А.В. Кузнецов ◽  
Н.И. Распопова ◽  
Е.С. Бехтерева ◽  
О.В. Громова
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Least Square ◽  
Rotational Structure ◽  
High Resolution Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Silane Molecule ◽  
Least Square Fit ◽  
First Time

A study of the fine rotational structure of the silane molecule absorption spectrum was carried out for the first time. The high-resolution spectrum of 28SiD4 was recorded in the 1260-1480 cm-1 spectral range the vibrational ν2+ν4 (F1,F2) and 2ν4 (F2) bands were theoretically analyzed. Rotational, centrifugal distortion, tetrahedral splitting and resonance interaction parameters of the upper vibrational states were obtained from the weighted least square fit method. The set parameters obtained reproduces the initial vibrational-rotational structure of the ν2 + ν4 (F1, F2) and 2ν4 (F2) bands with an accuracy of drms = 3.9 · 10-4 cm-1.

The B2Σ+–A2Πr system of MgCl

1988 ◽  
Vol 66 (7) ◽  
pp. 570-575 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena ◽  
G. S. Ghodgaonkar
Keyword(s):  
High Resolution ◽  
Rotational Structure ◽  
Rotational Constants ◽  
First Time

The 0–0 band of the B2Σ+–A2Πr system of MgCl near 4730 Å has been photographed at high resolution and analyzed for its rotational structure for the first time. Rotational constants have been determined for the B state, which is shown to be 2Σ+. Rotational perturbations have been observed in the F2 sublevels for J < 42.5 and in the F1 sublevels for J ≤ 16.5 of the B2Σ+ state.

The d3Σ–a3Πr Transition of SiO

1974 ◽  
Vol 52 (7) ◽  
pp. 569-574 ◽  
Author(s):  
M. Singh ◽  
H. Bredohl ◽  
F. Remy ◽  
I. Dubois
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
High Resolution Spectrum ◽  
Initial State ◽  
Final State ◽  
Rotational Constants ◽  
High Frequency Discharge ◽  
Low Pressures

The triple headed and violet degraded band of SiO at 2970 Å has been excited in a high frequency discharge through a mixture of SiCl4, oxygen, and argon flowing at low pressures. From a study of the high resolution spectrum, this band has been assigned to a 3Σ–3Π transition. The final state has been identified with the well known a3Πr state of SiO, and the initial state has been designated as the d3Σ and located at 33 640 cm−1 above the a3Πr. The rotational constants determined for the d3Σ state are (in cm−1): [Formula: see text]

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