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What is accelerator mass spectrometry? What type of information does this method provide?

Short Answer

Expert verified

Accelerator mass spectrometry (AMS) is a novel technology of mass spectrometry that differs from conventional mass spectrometers in that the lon is accelerated to a very high kinetic energy before being mass analysed.

Step by step solution

01

Step 1. Given information

Accelerator mass spectrometry is a kind of mass spectrometry in which ions are accelerated to extremely high kinetic energy before being analysed for mass. The ability of AMS to differentiate a rare isotope from an abundant surrounding mass is its unique strength among mass spectrometric approaches.

02

Step 2. accelerator mass spectrometry 

A mass spectrometer is a device that creates ions and then separates them by their mass-to-charge ratio. There are several different types of mass spectroscopy devices on the market right now.

The mass-to-charge ratio mzis a unitless number generated by dividing an atomic or molecular ion's mass number by the charge existing on it.

The chemical ingredient that must be evaluated in an analytical method is known as an analyte.

03

Step 3. Information provided by this method

Accelerator mass spectrometry (AMS) is a novel technology of mass spectrometry that differs from conventional mass spectrometers in that the lon is accelerated to a very high kinetic energy before being mass analysed.

The analyte is removed from the sample as negative ions by bombarding it with a stream of cesium ions. After that, the analyte ions are accelerated through a beam tube and transformed to positive ions.

In the presence of high levels of a stable isotope, accelerator mass spectrometry permits the identification of unstable isotopes.

As a result, accelerator mass spectroscopy is defined as mass spectroscopy that employs a variant in isotope-ratio approach.

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Most popular questions from this chapter

Discuss the difference between an isobaric interference and a polyatomic ion interference in ICPMS.

Why has ICPMS become an important and widely used analytical method?

Lezius has described a B-TOF mass spectrometer, presented the theoretical background for the instrument, and provided early experimental results.

(a) What is a B-TOF mass spectrometer?

(b) Explain how the instrument works.

(c) For what types of experiments is the instrument useful?

(d) Define the term start-up energy.

(e) The deflection velocity xห™of an ion in the flight tube is given by

xห™=qdBm

where q=ze, and Band mhave their usual significance, and d, shown in Figure 1 of the paper, is the width of the magnetic field region. The deflection velocity is the component of the velocity perpendicular to the initial flight path of the ion. Derive this expression. What is curious about the deflection velocity?

(f) Show that the deflection xof the ion perpendicular to the initial flight path of the ion is given by

x=(l+d/2)qdBmvcosฮฑ

where lis the distance traveled by an ion in its initial direction along the axis of the spectrometer after it leaves the magnetic field region, and vis the velocity of the ion along the deflected path. Why are the distances xand limportant in the B-TOF experiment?

(g) The TOF tMDof an ion to traverse the distance lfrom its exit from the magnetic field is given by

tMD=12Etotm-xห™2

What is Etot? There is an error in equation 6of the paper. Find and explain the error.

(h) Using the conservation of energy, derive the expression in (g).

(i) For small deflection angles, cosฮฑโ‰ˆ1. What are the consequences of this condition for ions of the same charge and mass?

(j) Look up some typical values for Etot, l, and v, and use Excel to calculate typical values for tMDfor a realistic range of values for m. Produce a plot of tMDversus m.

Describe how glow-discharge mass spectrometry is carried out. What are the advantages of this technique?

Describe the interface between the ICP torch and the mass spectrometer in an ICPMS instrument.

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