Abstract
An electrospray with a coflowing nebulizing air is characterized for three different electrospray modes: spindle, cone jet, and unstable. An electrospray with dimensions used in a mass spectrometer with 150-μm ID nozzle was characterized. The droplet size and velocity distributions were measured using a Phase Doppler Particle Analysis (PDPA) with and without the coflowing air. The significance of the coflowing air on the final spray droplet size and velocity distribution is found to depend on the electrospray mode. Generally, the coflowing air increases both the droplet size and velocity distributions, and the increase is more significant in the spindle mode than the cone jet mode.
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