No abstract

Turnover research has traditionally examined intention to turnover rather than actual turnover. Such studies assume that leave intent serves equally well as both a proxy for and predictor of employees’ actual turnover behavior. The purpose of this study is to provide an agency-level evaluation of the usefulness of turnover intention as a reliable proxy and predictor of actual turnover across 180 U.S. federal agencies, using hierarchical (stepwise) multiple regression. Our findings suggest that, at the organizational level, turnover intention and actual turnover are distinct concepts, predicted by different sets of variables. Based on these findings, we conclude that public managers tasked with retention might have better foresight concentrating on their agencies’ unique demographic characteristics and specific management practices, rather than on their employees’ self-reported aggregated turnover intention rate.

A proton-transfer reaction mass spectrometer based on time-of-flight mass spectrometry is described. This instrument couples a radioactive ion source and drift tube with a reflectron time-of-flight mass spectrometer. Volatile organic compounds in the gas phase with concentrations at the parts per billion by volume level can be detected in a matter of seconds, and crucially, the multichannel data acquisition in TOF-MS means that this detection sensitivity is available in all mass channels simultaneously. The typical mass resolution (m/Deltam) is in excess of 1000. The performance of the instrument is demonstrated using urban air measurements and a linear response/calibration test.

No abstract

A drift tube capable of simultaneously functioning as an ion funnel is demonstrated in proton transfer reaction mass spectrometry (PTR-MS) for the first time. The ion funnel enables a much higher proportion of ions to exit the drift tube and enter the mass spectrometer than would otherwise be the case. An increase in the detection sensitivity for volatile organic compounds of between one and two orders of magnitude is delivered, as demonstrated using several compounds. Other aspects of analytical performance explored in this study include the effective E/N and dynamic range over which the drift tube is operated. The dual purpose drift tube/ion funnel can be coupled to various types of mass spectrometer to increase the detection sensitivity and may therefore offer considerable benefits in PTR-MS work.3