Full width half maximum FWHM

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. 

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. 

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... 

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... 

For most applications that involve quadrupoles, the resolution is set to resolve adjacent m/z values (i.e., unit resolution). The MS peak width in this case is generally about 0.7 atomic mass unit (u) full width half maximum (FWHM). Recently, a commercial TQMS was introduced that features enhanced mass resolution. Two citations have appeared in the Uterature on the application of this instrument for quantitative bioanalysis [31,32]. In these studies, the Q3 resolution was set to give peaks widths as low as 0.1 u. From the data presented thus far, the S/N appears to remain constant as the mass... 

Experimental Setup. An obvious extension of the one-color pump-probe experiments is the application of two-color experiments in which two independently tunable dye lasers share the same pump laser. One can use the same high repetition rate and obtain spectral evolutions on excitation at selected wavelengths. The measurements are performed in essentially the same way as one-color experiments.A disadvantage is the broadened instrument function (cross-correlation function) caused by time jitter between the two pulses, since they are not obtained from the same dye laser. This leads to a full-width half-maximum (fwhm) value of the instrument function of approximately 5-10 psec. 

Inserting protons at - 0.10 V for 3 min (the position of the first redox peak in Fig. 1) turns the electrode green. The effect of proton insertion is clearly seen in the photoelectron spectrum, a low binding energy shoulder appears in the W 4f core level region (Fig. 2a). The new state, referred to as is shifted - 1.27 eV relative to and has a relative intensity of 0.22 with a full width half maximum (FWHM) of 0.91 eV. We also observe that the state increases in FWHM to 1.27 eV. The intensity of the state in the bandgap region has also increased. 

In SkyParams.xlsx the user defines the sky map to be created if no science input map is used. The first sheet in the file is the one that the simulator reads, so different configurations can be stored in the same file. The first option is the Full Width Half Maximum (FWHM) if empty, a point source is created, if full, a Gaussian source is simulated with this FWHM. The user may input the source position in the sky at jc j)os and y j)os. If empty the simulator will display a sky grid where the user selects the position or a source by clicking on that position. Temp is for the temperature in Kelvin of a Blackbody spectrum, cut-on and cut-off will filter the Blackbody spectrum at the wavenumbers given at these parameters. For verification purposes, if the user inputs 1 the spectrum for that given source will be the one measured with the Cardiff-UCL FIRI testbed. If the user inputs 0 the spectrum will consist of a single wavenumber tone, defined at tone wl. 

The limit at which two particles can be recognized as separate entities is approximately equal to the full-width half-maximum (FWHM) of the PSF. For the instrumental conditions given in Section II,B,1, we found by the Gaussian approximation the FWHM to be 0.27 ju.m in the lateral direction and 0.49 /im in the axial direction. 

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