Peak width at half-height

The peak width at half height (wq.s) is the distance between each side of a peak, measured at half the peak height. The peak width measured at half height has no significance with respect to chromatography theory. 

Nuclear Magnetic Resonance. The sampie is dissolved in anhyd (0.02% w) dimethylformamide and the NH4 peak width at half-height measured at 7.38t and compared with a graph prepd from samples of AP contg known amts of w. 

Figure 7.4 Change In peak width at half height as a function of nigration distance for a typical test nixture on a high perfomance TLC plate. The values for b, and bf are calculated by extrapolation using linear regression.

K Wn Capacity factor Peak width at half height t /to ... 

The FT-ICR/MS is an ideal instrument for studying ion-molecule reactions over an extended time scale due to the excellent trapping of ions in the cell and the unmatched mass resolution and mass accuracy. Mass resolution is defined as the mass divided by the peak width at half height... 

Figure 5. Effect of electron radiation fluence on the Tg damping peak width (at half height). (Reproduced from reference 8.)...

Fig. 2.15. Effect of decreasing on KER. The peaks from MIKE measurements belong to the m/z 58 ion product ion of alkene loss (ethene to hexene) from homologous iminium ions. The KER is determined from peak width at half height.

Determination of retention time and peak width at half height. 

On a 1000 cm wall coated tabular column of 0-25 mm bore, the helium carrier gas velocity is 40 cm/sec. The retention time tjf, for decane is 1-28 min peak width at half height is 0-88 sec. The retention time for a non-retained compound is ... 

Peak Width. Peak width depends on the mass resolution. A resolution of 1 mass unit is sufficient to distinguish ions in most qualitative/quantitative small molecule applications. A typical definition of unit resolution is when the peak width at half-height is about 0.6 to 0.8 mass unit. The profile scan of ions on a typical benchtop LC-MS has a bandwidth of about 1 mass unit (Figure 13.1). 

Consider two compounds for which /M = 1 min, /, — 11.30 min and t2 = 12 min. The peak widths at half-height are 10 s and 12 s, respectively. Calculate the values of the respective resolutions using the relationships from the preceding exercise. 

Vr - VM CD, peak base fg, peak width, W HJ, peak width at half-height, Wq BE,peak height E, peak maximum CHEJD, peak area (space incorporated within these letters) KL, step height of integral chromatogram. ... 

Peak width at half-height. Wq 5. The length of the line parallel to the peak base, which bisects the peak height and terminates at the intersections with the two limbs of the peak, projected on to the axis representing time or volume. 

COLUMN EFFICIENCY. Two methods are available for expressing the efficiency of a column in terms of HETP one is to measure the peak (Figure 1.18) width at the baseline (Equation 2.55) the other is to measure the peak width at half-height (Equation 2.57). 

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