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PSMs and approximate quantitative error for IRMPD using different irradiation times. Using a straightforward data-dependent IRMPD irradiation time to normalize performance vs. precursor m/z, we see that the highest numbers of PSMs occur using shorter irradiation times, with best quantitative accuracy at longer irradiation times. We attribute this to more secondary dissociation at longer times producing greater reporter tag intensity at the expense of b- and y- type fragment ions.
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