Rotational analysis of the A–X bands of AsO+

1969 ◽  
Vol 47 (15) ◽  
pp. 1601-1604 ◽  
Author(s):  
Rama Shanker ◽  
I. S. Singh ◽  
O. N. Singh
Keyword(s):  
Rotational Analysis ◽  
Third Order ◽  
Rotational Constants ◽  
The Third ◽  
Concave Grating

The (1,0) and (2,0) bands of the A–X system of the AsO+ molecule have been recorded in the third order of a 35-ft concave grating spectrograph. The rotational analysis has been carried out and the transition has been found to be 1Π–1Σ. The rotational constants are given.

Rotational Structure in the (2,0) Band of the C2 Δ3/2–X2 Π1/2 Subsystem of SbO

1974 ◽  
Vol 52 (7) ◽  
pp. 592-598 ◽  
Author(s):  
S. B. Rai ◽  
B. Rai ◽  
D. K. Rai
Keyword(s):  
Excited State ◽  
Ground State ◽  
Rotational Structure ◽  
Third Order ◽  
Rotational Constants ◽  
The Third ◽  
Concave Grating ◽  
Combining States

The rotational structure in (2,0) band of C2Δ3/2–X2Π1/2 subsystem of SbO molecule has been photographed in the third order of a 35 ft concave grating spectrograph, and the rotational constants of the two combining states have been determined. It is found that the new rotational constants for the ground state are in agreement with those reported by Rai et al., but the constants for the excited state differ appreciably from those reported earlier by Rao and Rao. A small λ-type doubling (≈4.0 × 10−6 cm−1) is observed in the excited state. The isotopic lines due to 123SbO have also been observed.

THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

Rotational Analysis of B–X2 System of 208PbF

1972 ◽  
Vol 50 (18) ◽  
pp. 2206-2210 ◽  
Author(s):  
O. Nath Singh ◽  
I. S. Singh ◽  
O. N. Singh
Keyword(s):  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The rotational analysis of the three bands (1,0), (0,0), and (0,1) of the B–X2 system of PbF has been carried out. The bands have been excited in a transformer discharge and photographed in the second order of a 35 ft concave grating spectrograph. The analysis has shown that the bands arise from a 2Σ+–2Π3/2 transition. The rotational constants of the upper and lower states have been determined.

ROTATIONAL ANALYSIS OF THE VISIBLE EMISSION BANDS OF THE PbF MOLECULE

1964 ◽  
Vol 42 (4) ◽  
pp. 690-695 ◽  
Author(s):  
K. Madhusudana Rao ◽  
P. Tiruvenganna Rao
Keyword(s):  
Band System ◽  
Second Order ◽  
Rotational Structure ◽  
Visible Emission ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Visible Band ◽  
System A ◽  
Concave Grating

The rotational structure of the (0, 0), (0, 1), (0, 2), and (1, 0) bands of the visible band system (A–X1) of PbF has been examined in the second order of a 21-ft concave grating spectrograph having a dispersion of 1.25 Å/mm. A rotational analysis of the bands has led to a determination of the rotational constants of the upper and lower states. From consideration of electron configurations it is suggested that the system arises from a [Formula: see text] transition which is a case c equivalent of [Formula: see text].

ROTATIONAL ANALYSIS OF FOUR BANDS OF THE A–X SYSTEM OF BiO IN THE NEAR ULTRAVIOLET

1966 ◽  
Vol 44 (4) ◽  
pp. 705-712 ◽  
Author(s):  
Y. K. Sarat Chandra Babu ◽  
P. Tiruvenganna Rao
Keyword(s):  
High Frequency ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
First Order ◽  
High Frequency Discharge ◽  
Near Ultraviolet ◽  
Concave Grating

A rotational analysis of the four bands (0, 1), (0, 2), (0, 3), and (0, 4) of the near ultraviolet system of BiO in the region λ 3 860–λ 3 130 Å has been carried out. The bands have been excited in a high-frequency discharge and photographed in the first order of a 21-ft concave-grating spectrograph (30 000 lines per inch) with a dispersion of 1.25 Å/mm. The analysis has shown that the bands arise from a case (c) 1/2(2Π1/2)–1/2(2II1/2) transition. The rotational constants of the upper and lower states have been determined.

THE 0–0 AND 1–0 BANDS OF THE A(3Πi)–X(3Σ−) SYSTEM OF NH

1959 ◽  
Vol 37 (10) ◽  
pp. 1171-1186 ◽  
Author(s):  
R. N. Dixon
Keyword(s):  
Intensity Distribution ◽  
Room Temperature ◽  
Flash Photolysis ◽  
Electronic States ◽  
Third Order ◽  
Astrophysical Interest ◽  
The Third ◽  
Concave Grating

NH molecules have been produced during the flash photolysis of HNCO, and the 0–0 and 1–0 bands of the A(3Πi) ← X(3Σ−) system have been photographed in absorption in the third order of a 21-foot concave grating spectrograph. The intensity distribution in the bands showed that the molecules were approximately at room temperature. The lines of lowest J value are identified for 25 branches of the 0–0 band and 19 branches of the 1–0 band. The analysis of the 0–0 band leads to a correction of the published line assignments for this band. The spin splittings in both the A and X electronic states, and the A-doubling in the A state, are considered in detail. Wavelengths in air are given for lines of astrophysical interest.

Rotational analysis of A–X1 bands of PbF

1969 ◽  
Vol 47 (15) ◽  
pp. 1639-1641 ◽  
Author(s):  
O. N. Singh ◽  
M. P. Srivastava ◽  
I. S. Singh
Keyword(s):  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The rotational analysis of the four bands (0,0), (0,1), (0,2), and (1,0) of the A–X1 system of PbF has been carried out. The bands have been excited in a transformer discharge and photographed in the second order of a 35-ft concave grating spectrograph. The analysis has shown that the bands arise from a [Formula: see text] transition. The rotational constants of the upper and lower states have been determined.

scholarly journals The ultra- violet band of ammonia, and its occurrence the solar spectrum

1918 ◽  
Vol 94 (663) ◽  
pp. 470-471 ◽  
Keyword(s):  
Solar Spectrum ◽  
Ultra Violet ◽  
The Sun ◽  
Third Order ◽  
The Third ◽  
Other Substances ◽  
Violet Band ◽  
Band Spectra ◽  
Concave Grating ◽  
Unusual Appearance

A question of great interest in connection with the solar spectrum is that of the origin of the thousands of unidentified faint lines which were photographed and catalogued by Rowland. Some of these lines may possibly be identical with faint lines in metallic spectra which have not yet been completely tabulated, but in view of the presence of bands of cyanogen, carbon, and hydrocarbon, the possibility of the correspondence of most of them with band spectra of other substances should not be overlooked. As a contribution to this inquiry, the present investigation was undertaken primarily in order to determine whether Group P in the ultra-violet region of the solar spectrum might not be mainly due to the presence of ammonia in the absorbing atmosphere of the sun. Ammonia was already known to give a remarkable band in this region, having its greatest intensity near λ 3360, but existing records of the component lines were inadequate for comparison with the solar tables. Photographs were accordingly taken with instruments of various dispersions, ranging up to that of the third order of a 10 feet concave grating, a copper arc in an atmosphere of ammonia being employed as the source in the latter case. In view of the unusual appearance of the band, an attempt has also been made to elucidate the chief features of its structure.

Probe size and 5th-order aberration

1987 ◽  
Vol 45 ◽  
pp. 134-135 ◽  
Author(s):  
Zhifeng Shao
Keyword(s):  
Electron Probe ◽  
Spherical Aberration ◽  
Wave Length ◽  
Cylindrical Symmetry ◽  
Electron Wave ◽  
Third Order ◽  
The Third ◽  
Probe Radius ◽  
Small Probe ◽  
Probe Size

A small electron probe has many applications in many fields and in the case of the STEM, the probe size essentially determines the ultimate resolution. However, there are many difficulties in obtaining a very small probe.Spherical aberration is one of them and all existing probe forming systems have non-zero spherical aberration. The ultimate probe radius is given byδ = 0.43Csl/4ƛ3/4where ƛ is the electron wave length and it is apparent that δ decreases only slowly with decreasing Cs. Scherzer pointed out that the third order aberration coefficient always has the same sign regardless of the field distribution, provided only that the fields have cylindrical symmetry, are independent of time and no space charge is present. To overcome this problem, he proposed a corrector consisting of octupoles and quadrupoles.

Children’s Recall of Approximations to English

1973 ◽  
Vol 16 (2) ◽  
pp. 201-212 ◽  
Author(s):  
Elizabeth Carrow ◽  
Michael Mauldin
Keyword(s):  
Language Development ◽  
Fourth Order ◽  
Third Order ◽  
Memory Processes ◽  
The Third ◽  
General Index ◽  
General Linguistic

As a general index of language development, the recall of first through fourth order approximations to English was examined in four, five, six, and seven year olds and adults. Data suggested that recall improved with age, and increases in approximation to English were accompanied by increases in recall for six and seven year olds and adults. Recall improved for four and five year olds through the third order but declined at the fourth. The latter finding was attributed to deficits in semantic structures and memory processes in four and five year olds. The former finding was interpreted as an index of the development of general linguistic processes.

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