in atomic spectroscopy the spectral absorption and emission lines are very narrow. why are they more...
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in
atomic spectroscopy the spectral absorption and emission lines are
very narrow. why are they more...
In atomic absorption spectroscopy, which of the following causes atomic spectral lines to be broadened? Select...
In atomic absorption spectroscopy, which of the following causes atomic spectral lines to be broadened? Select one: a. light scattering caused by the sample matrix. b. sputtering of argon ions. c. Doppler shift. d. molecular emission by the flame gas. e. incomplete atomisation.
Atomic emission spectroscopy is more sensitive to flame stability compared to atomic absorption spectroscopy. Briefly explain...
Atomic emission spectroscopy is more sensitive to flame stability compared to atomic absorption spectroscopy. Briefly explain why.
What is the difference between atomic absorption spectroscopy and atomic emission spectroscopy ?
What is the difference between atomic absorption spectroscopy and atomic emission spectroscopy ?
Why are molecular absorbance spectra broad, while atomic absorbance spectra are narrow (“lines”)? What are the...
Why are molecular absorbance spectra broad, while atomic absorbance spectra are narrow (“lines”)? What are the major components of an absorbance instrument and what are their roles in spectral acquisition? Are absorbance measurements more qualitative or quantitative in nature (what useful information can we get from them)?
Why are emission and absorption spectra of molecules so much broader than atomic emission and absorption...
Why are emission and absorption spectra of molecules so much broader than atomic emission and absorption spectra? [HINT: Think about a molecular spectrum (like measuring the absorbance of quinine) vs analyzing calcium on an AAS.]
1.explain why there are more lines in the hydrogen emission spectrum than in the absorption spectrum?...
1.explain why there are more lines in the hydrogen emission spectrum than in the absorption spectrum? 2. indicate asborption, from a lower energy level to a higher energy level. Then indicate emission for the same transition as through various pathways, which would then result in many more emission peaks than there was in the original absorption (transition).
a) A photograph of an absorption spectrum is mostly bright with black spectral lines. A photograph...
a) A photograph of an absorption spectrum is mostly bright with
black spectral lines. A
photograph of an emission spectrum is black with bright spectral
lines. Why are they different? Explain
in 4-6 sentences.
b) Electron are accelerated between parallel plates in a tube
containing hydrogen gas at
ambient temperature. The potential difference across the plates
is 12.9 V. What spectral lines will be visible in the emission
spectrum? Make an energy diagram to support your answer.
380 450 590...
1. Which atomic spectroscopy technique has the greatest need for instrumental background correction? a) Atomic absorption...
1. Which atomic spectroscopy technique has the greatest need for instrumental background correction? a) Atomic absorption with flame atomization b) Inductively coupled plasma atomic emission c) Atomic absorption with electrothermal (furnace) atomization 2. Taking measurements at the peak absorption wavelength maximizes both sensitivity and linearity. True or False?
Would atomic emission spectroscopy be a useful technique for determining the oxidation state of arsenic in...
Would atomic emission spectroscopy be a useful technique for determining the oxidation state of arsenic in a water sample? Why or why not? (Bonus, what would an analyst have to do to determine oxidation state? (otherwise referred to as "speciation")) List two reasons why the excitation bandwidth using a hollow cathode lamp is much narrower than the emission bandwidth for atomic spectroscopy? Use an equation in your answer (hint, think Doppler).
Question 6 (3 marks) (a) Describe how you could use both graphite furnace atomic absorption spectroscopy...
Question 6 (3 marks) (a) Describe how you could use both graphite furnace atomic absorption spectroscopy (GFAAS) or inductively coupled plasma emission spectroscopy (ICP-AES) to analyse a blood sample that is suspected to contained elevated levels of lead (b) If the same blood sample was also thought to contain high levels of arsenic in addition to lead, which technique would you use? Explain why
a) A photograph of an absorption spectrum is mostly bright with
black spectral lines. A
photograph of an emission spectrum is black with bright spectral
lines. Why are they different? Explain
in 4-6 sentences.
b) Electron are accelerated between parallel plates in a tube
containing hydrogen gas at
ambient temperature. The potential difference across the plates
is 12.9 V. What spectral lines will be visible in the emission
spectrum? Make an energy diagram to support your answer.
380 450 590...
Question 6 (3 marks) (a) Describe how you could use both graphite furnace atomic absorption spectroscopy (GFAAS) or inductively coupled plasma emission spectroscopy (ICP-AES) to analyse a blood sample that is suspected to contained elevated levels of lead (b) If the same blood sample was also thought to contain high levels of arsenic in addition to lead, which technique would you use? Explain why
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