Instrumental Anal CH453Exam 2 version 1 February 28 2018 ref

Instrumental Anal CH453_Exam 2 (version 1) February 28, 2018 reference. The resonana frequency of 300 MHz and a field of 70,460 gauss with TMS as a the standard. (10 pts) at a frequency 1080 Hz higher than that of (a) What is the chemical shift? 300 16 (b) At what frequency will the proton resonate if a 100 MHz and 23,490 gauss magnet is used?

Solution

fo = Bo

where fo is the resonance frequency,

Bo is the strength of the externally applied field, = 23490 gauss or 2.39T

and is the gyromagnetic ratio, a constant specific to each specific nucleus or particle. For ¹H = 42.58 MHz/T

fo = (42.58 MHz/T) x (2.39T) = 101.77 MHz.