The mass spectrometer

# The mass spectrometer - The mass spectrometer The mass...

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The mass spectrometer The mass spectrometer involves three steps. First the ions are accelerated to a particular velocity; then just those ions going a particular velocity are passed through to the third and final stage where the separation based on mass takes place. It's worth looking at all three stages because they all rely on principles we've learned in this course. Step 1 - Acceleration In physics, we usually talk about charged particles (or ions) being accelerated through a potential difference of so many volts. What this means is that we're applying a voltage across a set of parallel plates, and then injecting the ions at negligible speed into the are between the plates near the plate that has the same sign charge as the ions. The ions will be repelled from that plate, attracted to the other one, and if we cut a hole in the second one they will emerge with a speed that depends on the voltage. The simplest way to figure out how fast the ions are going is to analyze it in terms of

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The mass spectrometer - The mass spectrometer The mass...

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