Intensity measurements in microwave spectroscopy the “antimodulation” method

Abstract It is shown that there occur two easily distinguishable line shapes in DRM spectroscopy. These reflect the change of the integrated intensity of the signal transition when pump radiation is applied. They readily permit deductions concerning the position of the shared energy level. This result is useful for the analysis of complicated spectra, as is illustrated with examples.An expression is derived which permits the determination of the integrated intensity of absorption lines by DRM techniques alone. It does not require knowledge of the absolute value of the pump power and provides, therefore, a convenient basis for relative intensity measurements without recurrence to Stark effect modulation.

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Microwave Spectra of Furazan. IV. Rotation Spectra of Vibrationally Excited States of Perdeuterated Furazan

Zeitschrift für Naturforschung A ◽

10.1515/zna-1990-9-1010 ◽

1990 ◽

Vol 45 (9-10) ◽

pp. 1131-1143

Author(s):

Otto L. Stiefvater

Keyword(s):

Ir Spectroscopy ◽

Excited States ◽

Relative Intensity ◽

Ground State ◽

Double Resonance ◽

Microwave Spectroscopy ◽

Vibrationally Excited ◽

Pure Rotation ◽

Intensity Measurements ◽

Modes Of Vibration

Abstract The pure rotation spectra of molecules in 25 vibrationally excited states of perdeuterated furazan, C2D2N2O, have been studied by double resonance modulation (DRM) microwave spectroscopy. Twelve of these spectra have been correlated, -on the basis of relative intensity measurements under DRM -, with fundamental vibrations as previously established by IR spectroscopy. Rotational parameters for these 12 fundamental levels are reported, and the contributions to the effective rotational constants and to the inertia defect of the ground state of d2 -furazan have been determined for 10 modes of vibration.

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ChemInform Abstract: DETERMINATION OF THERMODYNAMIC FUNCTIONS FROM ABSOLUTE INTENSITY MEASUREMENTS IN MICROWAVE SPECTROSCOPY

Chemischer Informationsdienst ◽

10.1002/chin.197347131 ◽

1973 ◽

Vol 4 (47) ◽

pp. no-no

Author(s):

R. F. CURL ◽

TATSUYA IKEDA ◽

R. S. WILLIAMS ◽

SHARRON LEAVELL ◽

L. H. SCHARPEN

Keyword(s):

Thermodynamic Functions ◽

Absolute Intensity ◽

Microwave Spectroscopy ◽

Intensity Measurements

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Study of the dinitrogen trioxide-water-nitrous acid equilibrium by intensity measurements in microwave spectroscopy

The Journal of Physical Chemistry ◽

10.1021/j100545a013 ◽

1976 ◽

Vol 80 (4) ◽

pp. 402-409 ◽

Cited By ~ 60

Author(s):

Ravi Varma ◽

R. F. Curl

Keyword(s):

Nitrous Acid ◽

Microwave Spectroscopy ◽

Intensity Measurements

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Thickness and composition determinations from T.E.M. specimens using both x-ray and backscattered electron data

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100112816 ◽

1984 ◽

Vol 42 ◽

pp. 576-577

Author(s):

M.D. Ball ◽

H. Lagace ◽

M.C. Thornton

Keyword(s):

Electron Microscope ◽

Atomic Number ◽

Transmission Electron Microscope ◽

Convenient Method ◽

Flow Chart ◽

X Ray ◽

Intensity Measurements ◽

Transmission Electron ◽

Electron Intensity ◽

Backscattered Electron

The backscattered electron coefficient η for transmission electron microscope specimens depends on both the atomic number Z and the thickness t. Hence for specimens of known atomic number, the thickness can be determined from backscattered electron coefficient measurements. This work describes a simple and convenient method of estimating the thickness and the corrected composition of areas of uncertain atomic number by combining x-ray microanalysis and backscattered electron intensity measurements.The method is best described in terms of the flow chart shown In Figure 1. Having selected a feature of interest, x-ray microanalysis data is recorded and used to estimate the composition. At this stage thickness corrections for absorption and fluorescence are not performed.

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