Questions tagged [mass-spectrometry]

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Velocity of ions in mass spectrometry

Suppose the gas contains two sorts of atoms (for example two isotopes of one element) with different masses. The electric force between the electrodes of in the gas chamber which accelerates them is 𝑞...
• 29
26 views

Is mass spectrometry convenient to separate elements in a mixture?

Are particle accelerators coupled to spectrometers ever used to separate and extract different components of a mixture? If so, how much substance can be treated per day in this way? Would it be a ...
22 views

What is the meaning of Scan Speed in case of a mass spectrometer?

For example if the scan speed is $15000 \frac{u}{s}$ then what does it mean? Since $u$ is a mass unit, then does $15000 \frac{u}{s}$ mean that the Mass Spec is able to scan mass of $15000$ per second?
194 views

Velocity of ion in electric field

I have an ion beam which moves with a velocity $v$ and stays in a region for time $t$. The region has decreasing electric field so the velocity is different for each point in the region, such that it ...
• 59
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Are spectrometer results affected by relativistic effects? [closed]

If you throw 2 same particles into mass-spectrometer, 1 relativisticly slow and 1 relativisticly fast, would you get same result?
• 103
63 views

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?
30 views

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 ...
65 views

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 ...
• 123
17 views

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 ...
60 views

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 ...
336 views

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 ...
• 297
1 vote
20 views

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 ...
18 views

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 ...
1 vote
16 views

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 ...
• 111
27 views

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 ...
• 11
63 views

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 ...
• 11
172 views

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 ...
• 21
300 views

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 ...
• 123
1k 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....
367 views

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 ...
• 151
220 views

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 ...
• 231
6k views

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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