Metastable yield of argon between 23 and 37 eV by electron impact

1979 ◽  
Vol 57 (10) ◽  
pp. 1624-1633 ◽  
Author(s):  
P. Marchand ◽  
J. Cardinal
Keyword(s):  
Electron Impact ◽  
Excited States ◽  
Signal To Noise Ratio ◽  
Negative Ion ◽  
Photon Yield ◽  
Large Signal ◽  
Signal To Noise ◽  
Monoenergetic Electron ◽  
Yield Curves ◽  
Noise Ratio

The metastable yield of argon excited by monoenergetic electron impact has been measured between 23 and 37 eV. Thanks to a large signal-to-noise ratio, many very small structures have been detected superimposed on the metastable continuum and are attributed to Ar− negative-ion states and to highly excited states of Ar. The results are compared with broadband photon yield curves and electroionization curves.

High-resolution photon yield of xenon by monoenergetic electron impact

1987 ◽  
Vol 65 (5) ◽  
pp. 510-517
Author(s):  
René Le ◽  
Pierre Marchand
Keyword(s):  
High Resolution ◽  
Electron Impact ◽  
Excited States ◽  
Broad Band ◽  
Electron Excitation ◽  
Negative Ion ◽  
Photon Yield ◽  
Monoenergetic Electron

The broad-band (165–650 nm) photon yield of xenon by monoenergetic electron excitation has been measured in the range from 10.9 eV to above 13.436 eV (2P1/2 limit). Neutral excited states and several new negative-ion states are detected. Interpretation and classification are discussed.

Gravity meter observation of free modes excited by the August 19, 1977 Indonesia earthquake

1979 ◽  
Vol 69 (5) ◽  
pp. 1445-1454
Author(s):  
John A. Linton ◽  
D. E. Smylie ◽  
O. G. Jensen
Keyword(s):  
Signal To Noise Ratio ◽  
Quartz Fiber ◽  
Large Signal ◽  
Signal To Noise ◽  
Definitive Evidence ◽  
Long Period ◽  
Noise Ratio

abstract Free modes with signal-to-noise ratio in the range of 40 to 55 dB were observed in the record taken by a vertical broadband quartz fiber gravimeter system opeating in Montreal following the event of August 19, 1977 in Indonesia. The large signal-to-noise ratio has permitted very stable Q estimates to be made for a number of the fundamental spheroidal modes. The very long-period band shows no definitive evidence of signal other than the expected tidal lines.

Non-linear filtering of rare events with large signal-to-noise ratio

1987 ◽  
Vol 24 (04) ◽  
pp. 929-948
Author(s):  
A. J. Heunis
Keyword(s):  
Conditional Distribution ◽  
Signal To Noise Ratio ◽  
Sample Path ◽  
Rare Event ◽  
Dirac Measure ◽  
Linear Filtering ◽  
Large Signal ◽  
Signal To Noise ◽  
Non Linear ◽  
Noise Ratio

The theory of robust non-linear filtering in Clark (1978) and Davis (1980), (1982) is used to evaluate the limiting conditional distribution of a diffusion, given an observation of a ‘rare-event' sample-path of the diffusion, as the signal-to-noise ratio and the diffusion noise-intensity converge to infinity and zero respectively. Under mild conditions it is shown that the limiting conditional distribution is a Dirac measure concentrated at a trajectory which solves a variational problem parametrised by the sample-path of the observed signal.

ON THE DISTRIBUTION OF THE PRODUCT OF DIODE DETECTOR WAVEFORMS

1956 ◽  
Vol 34 (7) ◽  
pp. 679-691 ◽  
Author(s):  
E. L. R. Webb
Keyword(s):  
Probability Distribution ◽  
Signal To Noise Ratio ◽  
Rayleigh Distribution ◽  
Large Signal ◽  
Signal To Noise ◽  
Radio Receivers ◽  
Impulse Function ◽  
Diode Detector ◽  
Mean And Variance ◽  
Noise Ratio

The probability distribution of the product of two waveforms such as come from the diode second detectors of radio receivers is examined over the whole range of signal to noise ratios. Computed curves of probability density are given for small and moderate values of signal to noise ratio and the limiting form for large signal to noise indicated. The pure noise case is the only one immediately available in terms of tabulated functions. Compared to the Rayleigh distribution it rises much faster, reaches its maximum sooner and lower, and decays much more slowly. The very large signal to noise ratio case approaches an impulse function. Estimates of mean and variance are given.

Local symmetric distortion boosted photon up-conversion and thermometric sensitivity in lanthanum oxide nanospheres

Nanoscale ◽  
2018 ◽  
Vol 10 (19) ◽  
pp. 9245-9251 ◽  
Author(s):  
Hao Suo ◽  
Xiaoqi Zhao ◽  
Zhiyu Zhang ◽  
Rui Shi ◽  
Yanfang Wu ◽  
...  
Keyword(s):  
Lanthanum Oxide ◽  
Signal To Noise Ratio ◽  
Site Symmetry ◽  
Large Signal ◽  
Signal To Noise ◽  
Local Site ◽  
Noise Ratio

Realizing sensitive sub-tissue thermometry with a large signal-to-noise ratio via finely tailoring the local site symmetry in La2O3:Er3+/Yb3+ nanospheres.

A DELTA‐MODULATION RECORDING SYSTEM FOR SEISMIC USE

Geophysics ◽  
1965 ◽  
Vol 30 (1) ◽  
pp. 51-53
Author(s):  
Noel J. Thompson
Keyword(s):  
Signal To Noise Ratio ◽  
Digital Systems ◽  
Digital Recording ◽  
Large Signal ◽  
Signal To Noise ◽  
Tape Transport ◽  
Channel Bandwidth ◽  
Magnetic Tape Recording ◽  
Delta Modulation ◽  
Noise Ratio

A system of delta modulation with magnetic‐tape recording is proposed. It should achieve excellent signal‐to‐noise ratio without excessive equipment complexity. The system would be of use in crustal seismology where large signal‐to‐noise ratio is more important than minimum channel bandwidth. The recording of data in binary form as achieved by delta modulation eliminates tape transport wow and flutter and certain other noise components found in analog recording. Compared to FM recording, delta modulation provides similar complexity of recording and nearly identical “quick‐look” playback equipment. Delta modulation has the advantage, in common with other digital systems, that, with more complete playback equipment (either analog or computer), excellent removal of transport speed variations is possible. Delta modulation is less complex than other digital‐recording systems, and combines many of the best features of both the digital and analog techniques.

THE IONIZATION AND DISSOCIATION OF SOME HALOGEN MOLECULES BY ELECTRON IMPACT

1960 ◽  
Vol 38 (3) ◽  
pp. 407-420 ◽  
Author(s):  
D. C. Frost ◽  
C. A. McDowell
Keyword(s):  
Electron Impact ◽  
Excited States ◽  
Electronic Structures ◽  
Negative Ions ◽  
Molecular Ions ◽  
Negative Ion ◽  
Iodine Monochloride ◽  
Monoenergetic Electron ◽  
Iodine Monobromide ◽  
Ionization Processes

The ionization and dissociation of chlorine, bromine, iodine, iodine monochloride, and iodine monobromide by electron impact have been studied in a mass spectrometer which uses a monoenergetic electron source. Many ionization potentials have been observed for these molecules which, of course, refer to the formation of the parent molecular ions in different excited states. These experimental results are discussed in terms of simple molecular orbital theories of the electronic structures of the different halogen molecules.Electron-induced dissociative ionization processes for the different substances have also been studied. Where possible, appearance potentials of both the positive and negative ions have been determined. These results have been used to construct potential energy diagrams illustrating the origin of some of the negative ion and dissociation processes observed.

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