free induction decay , FID (Abkürzung)

This signal is called the free induction decay (FID).

This free induction decay occurs on a timescale of 1-100 microseconds depending on instrument settings.

The raw free induction decay data obtained when performing the experiment are stored according to the formatting preferences of the instrument manufacturer.

The shape of lines in a nuclear magnetic resonance (NMR) spectrum is determined by the process of free induction decay.

Free induction decay (FID)

The resulting signal is called a free induction decay (fid), transient or interferogram that consists of a superposition of sine waves.

"The Quantum Origins of the Free Induction Decay Signal and Spin Noise,"

This microwave signal generated by the rotating magnetization vector is called free induction decay (FID) (see page 175 of ref ).

The form in which the data is stored varies, ranging from line lists that can be graphically displayed to raw free induction decay (FID) data.

Over time, this distribution can lead to a dispersion of the tight distribution of magnetic spin vectors, and loss of signal (Free Induction Decay).

This signal is known as the free induction decay (FID), and it contains the vector sum of the NMR responses from all the excited spins.

In Fourier transform ion cyclotron resonance and Orbitrap type mass spectrometers the signal intensity (Y-axis) is related to the amplitude of the free induction decay signal.

The closest parallel to SR is "pulsed NMR", in which one observes time-dependent transverse nuclear polarization or the so-called "free induction decay" of the nuclear polarization.

In Fourier Transform NMR, free induction decay (FID) is the observable NMR signal generated by non-equilibrium nuclear spin magnetisation precessing about the magnetic field (conventionally along z).

The resulting composite signal, is called a free induction decay, because typically the signal will decay due to inhomogeneities in sample frequency, or simply unrecoverable loss of signal due to entropic loss of the property being measured.

The following equation relates the Ernst angle, theta, to the experimental interpulse delay, d1; the duration of the Free induction decay, aka "acquisition time", or "at"; and the longitudinal relaxation time of the spin in question, T:

In Fourier Transform NMR spectroscopy and imaging, a pulse sequence describes a series of radio frequency pulses applied to the sample, such that the free induction decay is related to the characteristic frequencies of the wanted signals.

In practice, the value of which is the actually observed decay time of the observed NMR signal, or free induction decay, (to 1/e of the initial amplitude immediately after the resonant RF pulse)-- also depends on the static magnetic field inhomogeneity, which is quite significant.