Spec2
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SCF-Krypton absorption spectrum The following absorption spectrum was taken from a quartz capillary mounted with a crystal of stem cell factor (SCF) in krypton at approximately 5 atm pressure.
The interesting question arises: where is the krypton more concentrated? in the gas, or in the crystal?
Gas (assuming 5 atm) L • atm n P = RT = ( C ) 8.21 × 10 −2 ( 298K ) V mol • K 5atm C= ≈ 0.2 M −2 L • atm )(298K 8.21 × 10 mol • K
Crystal (assuming one site) Va = 34,773Α3 = 3.4773 × 10 −23 L 1atom 1mole C= ≈ 0.05 M 3.4773 × 10 −23 L 6.02 × 1023 atoms
Therefore, the krypton gas surrounding the crystal accounts for the most of the absorption.
The interesting question arises: where is the krypton more concentrated? in the gas, or in the crystal?
Gas (assuming 5 atm) L • atm n P = RT = ( C ) 8.21 × 10 −2 ( 298K ) V mol • K 5atm C= ≈ 0.2 M −2 L • atm )(298K 8.21 × 10 mol • K
Crystal (assuming one site) Va = 34,773Α3 = 3.4773 × 10 −23 L 1atom 1mole C= ≈ 0.05 M 3.4773 × 10 −23 L 6.02 × 1023 atoms
Therefore, the krypton gas surrounding the crystal accounts for the most of the absorption.
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