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Spectroscopy

CHM 1210L: General Chemistry Laboratory I
Spectroscopy and Atomic Spectra Supplemental Instructions.
Overview: This is a partial Journal Article Report (JAR). The primary instructions are Lab Report guidelines for Gen. Chem. on Pilot. That is what your grade will be based on. See the grading rubric on pilot. Also see the other resources presented. See the slides on Pilot.
Follow the general instructions noted above. The instructions below are specific considerations for the Spectroscopy and Atomic Spectra experiment.
This report will primarily focus on the results and discussion sections. Generally these reports do not require separate discussion and conclusion sections. The conclusion can be at the end of the discussion.
Cite references in the text using a standard method: ACS style guide (superscripts, or author – year), (guides available on Writing Center website). APA or MLA reference styles are also acceptable.
Title
Name
Partner
GTA name and section
Data & Results: Label and provide explanatory captions for all tables and figures. Discuss tables, figures, and equations in the text.
• See Grading Rubric for details on items needed.
• Paragraph introducing reader to the data and tables and figures presented. Tables and figures must be discussed in the text.
• All measurements should be accompanied with an uncertainty. In order to reduce complexity and time, GTA’s will provide the uncertainty in wavelength based on determination of the uncertainty in scale units for several spectroscopes. Be sure to discuss this in your JAR and when evaluating if your wavelengths match the literature values.
• Table 1. Calibration with Helium
• Figure 1. Calibration Plot – done with a plotting program such as Excel
• X-axis is scale (in “scale reading” units)
• Y-axis is wavelength in nm
• Best fit line should be fit from Excel or other program (Excel add trendline)
• Figure caption at the bottom of the figure.

• Table 2. Calculated and Experimentally Observed Hydrogen Spectrum Lines . See page 289. & slides.
• (Also having the scale reading first and then converting that to wavelength in the second column is more logical than the table on page 292. The same is true for the other tables.

Table 3- X. Meaningful captions, one table for each element, He, H, Hg, and one other. For example:
(the numbers in the table below are not real numbers)
Scale Reading
± ? Color Observation Expt. λ
(nm)
(± ?? nm) Literature
value (nm) %error
8.0 Violet Hard to see. 438
16.0 Blue Broad, weak 482
48.0 Red Bright 658

• Table 4 – x. Other Experimentally Observed Spectrum Lines (ex: Ar, Kr)
(You may do each element as a separate table.)
• Uncertainty in wavelength (see above).
• Observations on LED station
• Observations on light bulb station.
Total: He, H, and Hg and one other element, Light bulb station, LED station.

Discussion:
• The data collected during the experiment should be compared to literature values with references
• Reasoning for differences between experimental and literature values for wavelength should be given
• Identify the uncertainties in the H-atom measurements from Table 3 as random or systematic and explain.
• Discussion of light bulbs and LED observation and comparison with element line spectra
• Address the questions in narrative form NOT as a list of questions.
• Light bulbs:
i. Hand held grating versus spectroscope. How are the spectra the same? How are they different?
ii. Which light source looks the most like sunlight (i.e. looks like daylight)
iii. Comparison of CFL’s with Hg spectrum
• LED:
i. Are the led’s line sources or continuous? Which color bends the most? How does this compare with expectations from the diffraction grating equation?
• Conclusions (Claim(s))

References
• Be sure to reference the source for the literature values.
• In-text citations are necessary especially for the discussion.

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Category: Sample Questions