Intermodulation

A non-linear object will produce the intermodulation response to this signal, namely terms in (c + co2)t and (co, — to2)t. The classification intermodulation is preferred when col and co2 have considerably different values, whereas demodulation applies to the case where Od — co2 = 2col is relatively small. 

Non-linearity in amplifiers or other parts of the system gives rise to intermodulation distortion [Sinclair, 1989],... 

As shown below, the observed intermodulation of synchronized chemical reaction yields is clearly displayed in the kinetic zone and represents a valid tool for voluntary manipulation of their rates. 

Non resonant techniques are only of limited use to determine microwave losses with high precision, in particular when the losses are very small. Flowever, for the investigation of nonlinear absorption phenomena (i.e. rf power dependent on surface impedance or loss tangent) by intermodulation distortion measurements broad-band test devices are more common. Typically, a planar transmission line with an impedance of 50 Ohms can be employed for intermodulation... 

Fiir polarographische Zwecke erweist sich die Verwendung niederer Frequenzen (/ = bis 30 Hz, /2= 50 bis 150 Hz) als giinstig. Die ent-stehenden Intermodulations-Polarogramme sind verhaltnismaBig kom-pliziert und von den gewahlten Frequenzen abhangig (s. Abb. 26). 

Die Spitzenhohen sind der Konzentration proportional und konnen daher zur quantitativen Bestimmung herangezogen werden. Wird die Amplitude einer Wechselspannung gleich Null, so bilden sich keine Intermodulations-Polarogramme mehr aus. Da der Kapazitatsstrom... 

Flora eta, "Dynamic Analysis and Testing of Damped Intermodule Plates for the Sigma Laser Device," ASIAC Report No. 1182.lA, November 1982. 

Lefort. R. Etrillard. J. Toudic, B. Guillaume, F. Breczewski, T. Bourges, P. Incommensurate intermodulation of an organic intergrowth compound observed by neutron scattering. Phys. Rev. Lett. 1996. 77.4027. 

The reaction of elemental phosphorus with hydrogen was also used for PH2 production. H atoms from MW-discharged H2 were passed over the red modification, and the resulting PH2 was detected by LIF [51, 52], IMF (intermodulated fluorescence) [27], or MW spectroscopy [14]. The reaction of phosphorus vapor with atomic or molecular hydrogen did not lead to any PH2 electronic emission [18]. Emission bands, which had been observed during the reaction of elemental P with atomic H, were first attributed to PH2 [53,54], but they were later shown to be due to HPO [55]. 

A complete set of magnetic hf coupling constants and the P nuclear spin-rotation interaction constants (all in MHz) were obtained from an analysis of the hf structure of twelve lH(total H nuclear spin) = 0 and fourteen Ih=1 rovibronic lines of the A (0, 0, 0) X (0, 0, 0) band. An Intermodulated fluorescence (IMF) method was applied, which was first shown in [17] to be able to eliminate the Doppler width. A dye laser was employed as a source. Ground state constants were taken from a preliminary publication of [3] (T c was obtained with the sum rule) [6] ... 

Tables in the present chapter contain in their upper part data on the spin-rotation interaction constants e q (q = Inertial axes a, b, c) and In their lower part data on the rotational constants A, B, and C. Methods of measurement, references, and remarks are the same for either constant. The quartic (A, 8 and A, 5) and sextic (O, (p) centrifugal distortion constants listed In the first table (for the electronic ground state of PHg) are defined by the A-reduced form (asymmetric reduction) of the respective Hamiltonian for spin-rotation Interaction and rotation [1 to 3]. Abbreviations used in the tables are MW for microwave absorption, EL AB for electronic absorption, LMR for laser magnetic resonance, FIR for far IR, IMF for Intermodulated fluorescence.

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