2. Circle the most accurate answer (12% total): 500 level (6 part question): Do
ID: 2305911 • Letter: 2
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2. Circle the most accurate answer (12% total): 500 level (6 part question): Do a, b, c, d, e, f 400 level -(4 part question): Do a, b, c, d A. Compare a 4s orbital to a 2s orbital in a uranium atom. An ???? x-ray source can lead to the photoemission of the 4s line. What type of photon source might be successful at probing the 2s orbital? (a) UV lamp 20 eV) (b) MgKa (1253.6 eV) (c) AlKa 1486.6 ev) (d) AgKo: 2984.2 eV) (e) hard x-rays from a synchrotron (5000 ev) B. For a peak that exhibits a plasmon loss satellite, the area of the plasmon loss should be added to the main peak for quantitative analysis TRUE FALSE C. Once the x-ray energy is above the threshold value needed to stimulate photoemission, increasing the x-ray intensity (without increasing its energy) will lead to (a) no change in photoemission (b) higher energy photoelectrons (c) more photoelectrons (d) lower energy photoelectrons D. Purchasing both an AlKa and a MgKa source for an ESCA instrument is an expensive proposition. Which of the following is a significant technical advantage associated with this extra investment. (a) the ability to publish more papers (b) the ability to excite different core levels (c) increased retardation energy (d) the ability to distinguish Auger and photoemission linesExplanation / Answer
For A part. Hard xray source would be suitable for the 4s level. Because the 4s level which is outside have low binding energy compare to the 2s level. We can also see this by the hydrogen model where energy is proportional to n^2 so for 2s level factor is for and for 4s factor is 16 so we would require almost 4 times of the energy atleast two times don't know the exact answer.
Part B No
Part C. We will get more photoelectrons
Part D we would be able to distinguish auger and photoemission line.
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