Questions tagged [mass-spectrometry]

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Mass Spectrometry sensitivity

What is the sensitivity of a mass spectrometer? Would it be able to detect 2 ions? Or does it have to be many in order for them to be detected? I tried searching for this online, but I couldn't find ...
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Calculating the base peak from a mass spectrometry

Consider we have the following fragmentation of propane, obtained by mass spectroscopy: Which, if I haven't made mistakes, leads us to the following mass spectrum: It's clear that the molecular peak ...
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How is Mass Defect dimensionally correct? [closed]

Where the Mass Defect is $∆M = M-A$. So how does $(M-A)$ have the unit of mass, as A is the mass number?
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What is the limitation on putting liquids into a vacuum chamber?

I am a student designing a physics vacuum and material science curriculum for my Senior Design project. It is for a week-long session, so we are attempting to make 1-day experiments. I say this to ...
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A charged particle in a mass spectrometer travels approximately the speed of sound. Do charged particles share similar properties with sound waves?

I've calculated the speed of a charged particle in a mass spectrometer through the Bernoulli equation to be around the speed of sound. I've also seen marketing videos from mass spectrometer vendors ...
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Do mass spectrometers with velocity selectors measure Q/m for the entire specimen at once?

As i understand it the velocity selector only allows through one velocity - the other ions are deflected - and Q/m is measured dependent on the B field in the ion detector and the orbital radius. ...
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Charge measurement and mass spectrometer

When reading about how we can use a mass spectrometer in order to determine the mass of atoms/ions, several books that I have considered say that a mass spectrometer allows for a measurement of the ...
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Quadruple Mass Spectrometer - Transition metal detection

We use a QMS in our vacuum chamber, mainly for residual gas analysis. In a recent project I tried using it during the an argon sputtering of carbon infested Ni(111). I got a lot of carbon- hydrate ...
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Mass of Isotope

I am designing a simple Mass Spectrometer. I need to find radius of $Pb_{204}^{-}$ when deflecting. I have this equation: I know everything in that equation except the mass. I have How can I find ...
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Is there a way to experimentally determine the true mass of C-12 isotope which is defined exactly as 12 amu?

As most you know the measurement of atomic masses has > 200 year old history and atomic masses were deduced on the basis of chemical reactions by meticulous chemists until the 1940s. Later, mass ...
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Are ions in a flowing solution affected by magnetic fields

Are ions which has been dissolved in water affected by magnetic fields in any measurable way? Basically, I want to measure different ions in a water solution. Would it be possible to build a mass ...
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Hyperspectral Imaging

Is it possible for a HSI camera to detect how long back a particular wound occured in the body? Eg: There's a body for postmortems with some marks/wounds at some places, can a HSI camera help us in ...
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What is the physical meaning of a molecular fragment having two appearance energies?

Appearance energies are particularly import when it comes down to mass spectrometers that use electron impact bombardment. They typically denote the quantum energy value for fragmenting the molecule ...
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Is there a mass spectrometer software that can measure the mass of a hydrogen atom [duplicate]

For a school project I need to measure the mass of a hydrogen atom either as a lab experiment or with a computer simulation. Since I don't have the appropriate equipment for the experiment, does ...
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Is there a mass spectrometer software that can measure the mass of a proton

I spent a lot of hours looking for mass spectrometer software (or Cathode-ray simulator) that can measure the mass of a proton or any sub atomic particle. Until now I only found software that work on ...
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Atomic Structure History

I was reading a book about atomic structure history (Chemistry in Context by Graham Jill and John Holman), and got interested in few points which is not explained in the book. "Calculations based on ...
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Why didn't accelerator mass spectrometry greatly improve the accuracy of carbon dating?

My understanding of the limitation of radiometric dating is that background radiation swamps the radiation from C14 once the remaining atoms get few enough in number. Accelerator mass spectrometry ...
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929 views

Velocity distribution in ion source (electron bombardment) for Bainbridge mass spectrometer

Consider the following schematics of a Bainbridge mass spectrometer (Source: http://www.schoolphysics.co.uk/age16-19/Atomic%20physics/Atomic%20structure%20and%20ions/text/Mass_spectrometer/images/1....
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Looking for raw interferogram data / raw FID data from FT-IR / FT-NIR / FT-NMR

I'm trying to get my hands on some raw interferogram data / raw FID data from an FT-IR / FT-NIR / FT-NMR so I can run some tests using FFT with it (it needs to be real data). Here's a picture below of ...
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Can a discrete dynode mass spec detector get “tired?”

In an electron multiplier (discrete dynode detector), one electron triggers the release of more electrons in a cascade. Is it possible that a "large" number of electrons hitting the detector can ...
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Is ultradense deuterium real?

I've found several articles discussing experimental evidence of a deuterium state of densities over $140 \textrm{ kg}/\textrm{cm}^3$: F. Winterberg. Ultradense Deuterium. arXiv. Shahriar Badiei, ...
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Experimental limits on anisotropies in the $e/m_{e}$ ratio

Currently the charge-to-mass ratio of the electron is known to 10 orders of magnitude. However, i'm curious if: Are there any experiments trying to bound the anisotropy of this ratio for different ...
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How small of a depletion signal can the best modern mass spectrometers detect?

So I know the answer to this question varies widely across mass spec techniques, masses, and, of course, budgets, but my question is about the best case scenario for all of these variables (although I'...