Full-Width Half-Maximum

The ECAP incorporates an electrostatic lens in the time-of-flight spectrometer in order to improve the mass resolution by compensating for small spreads in the energies of the ions evaporated from the specimen under the pulsed electric field. A lens design by Poschenrieder or a reflectron type of electrostatic lens is used for this purpose, and is standard equipment for metallurgical or materials applications of APFIM. These typically improve the mass resolution at full width half maximum (FWHM) from m/Am 250 to better than 2000. 

On the assumption that the background bremsstrahlung has been removed, and that the data are in the form of the measured intensities at full width half maximum (FWHF), equation (1) can be used to calculate the ratio of the number of atoms of A to the number of atoms of B, i.e. the concentrations in the binary material. 

Farrens and Song<40) have replaced the original spark source with a picosecond diode laser in a multiplexed dual wavelength T-formatfluorometer.(41)With an overall instrumental response width of ca. 300 psec full-width half-maximum (FWHM), near-IR fluorescence lifetimes as low as 75 psec in the case of l,l -diethyl-4,4 carbo-cyanine iodide (DCI) (excitation 660 nm) and decay components as low as 48 psec in the case of 124 kDa oat phytochrome (excitation 752 nm) were reported. 

Only one peak observed, but the full width half-maximum (FWHM) suggests presence of two distinct species. This is confirmed by two distinctly resolvable peaks in N(ls) spectra. 

Field ion spectrometer The Revised Black Book Totalforsvarets forskningsinstitut, Sweden Forster resonance energy transfer Fourier transform mass spectrometry Full width, half maximum Guerrilla s arsenal Gas chromatography... 

Lithium-Drifted Germanium Detectors. Two kinds of planar Ge(Li) diodes were fabricated in our Laboratory for the spectrometer (I). The chief consideration was maximum cross section with a resolution of less than 3 k.e.v. at 60Co FWHM (full width half maximum). The available single-crystal germanium material dictated the shape of the detector. The first detector was fabricated from a 15-cm. long Sylvania ingot with a trapezoidal cross section its finished dimensions were 6 cm. X 3 cm. X 1 cm. Our second detector was fabricated from circular Hoboken stock (NPC Metal and Chemical Co., Los Angeles) its finished dimensions were 2.8 cm. diameter X 1.2 cm. thick. 

The crystal of the Ge(Li) detector was 35 mm in diameter and 27 mm long. It had a nominal active volume of 20 cm3 and resolutions of the 1332.5 keV photons of 2.18 (full width—half maximum) and 4.09 keV (full width—0.1 maximum). Counting losses at 20% dead time were about 6%. 

The aim now, is to identify all the filament events over OHP during the three winters 96-97,97-98 and 98-99 and understand their effect on the ozone amount. To detect the filament events, we choose a potential vorticity threshold corresponding to the lower edge of the vortex We use the equivalent latitude to represent the PV and the PV threshold is calculated from the first and seconde derivative of the PV as a function of equivalent latitude.lt corresponds to the closest position between the value of the full width half maximum of first derivative and maximum of the second derivative. 

The ground-state absorption spectrum of the Cr3+ impurity incorporated in LiCAF crystals consists of two absorption bands occurring at 15 873 and 23 255 cm-1 due to 4,42j, — 4T2g and 4A2g —> 4T ig transitions, respectively, as well as two sharp features near 15 413 and 16 408 cm-1 which arise from 2Eg and 2Tlg excited states [5]. The emission spectra are typical for the 4T2g 4A 2g transition, with the peak situated near 13 200 cm-1 and the full-width half-maximum of about 2000 cm-1 [5]. 

The PCVD process has now been in operation under pilot plant conditions for some years. Figures 20 and 21 give the attenuation and full width half maximum pulse broadening of 200 successive fibers selected at random from the production24). The Figures reflect the good control that can be achieved by the PCVD process under production conditions. 

Bandpass filters can be described in several ways. Most common is the Center Wavelength (CWL) and Full Width Half Maximum (FWHM) nomenclature, or alternatively, by nominal Cut-on and Cut-off wavelengths. In the former, the exciter in Fig. 2 is described as a 580/20 or, a filter with nominal CWL of 580 nm and a FWHM of 20 nm. The half maximum value is taken at the transmission value where the filter has reached 50% of its maximum value (Figure 3). In the latter scheme, the filter would be described as having a Cut-on of 570 nm and a Cut-off of 590 nm, no CWL is declared. The Cut-on describes... 

We take a Gaussian distribution of chain lengths with a full-width half maximum AL and peaking at Lp to account for the expected disorder in the liquid phase at room temperature. 

Full-width-half-maximum (fwhm) - half-peak-width... 

Half-peak-width — Also known as full-width-half-maximum (fwhm), peak width at half-height, Wi/2 When any experimental technique produces a peak that rises from and falls back to approximately the same base line, that peak may be characterized by its width at half the full height. In electrochemistry, the requisite peaks can be produced by -> cyclic voltammetry... 

Equations (6) and (7) predict a transition whose width will be small if the NC sample is monodisperse (i.e., all particles have the same a value). However, even samples with a narrow size distribution show transition line widths of —30 nm FWHM (full width half maximum), which is significantly broader than expected. This line broadening is due to both homogeneous broadening related to phonon excitations in the NC and inhomogeneous broadening due to interactions with the surrounding environment. ... 

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