Description
NMRQA is an App containing
169 simple revision questions and answers on NMR. This App is not
intended for people who are not familiar with the basic concepts of
NMR. Obviously it is not intended for NMR experts. It is intended for
scientists and research students who are using
NMR and want to check their knowledge of basic NMR facts, experimental
parameters, signal processing, relaxation and methods of obtaining
maximal signal-to-noise. NMRQA may also be useful for undergraduate
students undertaking advanced courses on 1D-NMR. It only gives short
single or two sentence
answers and so it is not intended to replace textbooks or user manuals
but it may help you understand them. If you want to analyze pH
dependent changes in chemical shift you may find the program "ppmfit"
on the Mac app store useful. If you want to estimate the contributions
of dipolar relaxation and relaxation by Chemical Shift Anisotropy(CSA)
to the T1 values of carbon atoms then you should find "T1calc" in the
Mac app store useful.
It does not contain the material covered in most undergraduate lecture courses or elementary texts and it is limited to 1D NMR. Its focus is on practical aspects. It is hoped it will help you interact with NMR operators and set up your own NMR experiments. There is a list of the topics covered below.
What is new in the iPhone version 2.5
The App has been updated and 4 new questions added.
What is new in the iPhone version 2.4
The overlay of text in questions 59-84 has been corrected.
What is new in the iPhone version 2.3
Further Minor bug fixes ensuring compatibility with multiple devices.
What is new in the iPhone version 2.2
Minor bug fixes ensuring compatibility with multiple devices.
What is new in the iPhone version 2.1
In this version the app has been updated with 24 new questions and answers. There are new questions on; using the inversion recovery pulse for determining T1 values, on 18O isotope shifts and their uses in carbon-13 NMR and proton and 13C coupling in 13C-NMR.
What is new in the iPhone version 2.0
In the version 1 there was a single window and you had to answer all 141 questions. This version has the same questions but now has 8 windows. The first four windows give between 25 and 43 questions each which allows you to select the group of questions you want to answer. Windows 5,6,7 and 8 are information windows which list the topics covered by the questions in the windows 1,2,3 and 4.
Topics include
Larmour frequency and NMR operating frequency
Chemical shift
Gyromagnetic ratio
Locking and shimming
Sensitivity and natural abundance 1H,13C,15N, 19F and 31P
Pulse widths
Paramagnetic effects on signals
T2 relaxation and optimum acquisition time
Zero filling
Signal-to-noise
Folding and truncation
Exponential multiplication and linebroadening
T1 relaxation
Ernst equation
Optimising pulse rate and pulse angles
Measuring T1 values using the progressive saturation technique
Measuring T1 values using the inversion recovery technique
Dummy scans
Dipolar and CSA relaxation
Effect of molecular size on dipolar and CSA relaxation
Effect of magnetic field strength on dipolar and CSA relaxation
Solid State NMR
Magic angle spinning
Cross polarisation
CPMAS
Dynamic Nuclear Polarisation (DNP) in solid state NMR
Temperature jump DNP
For iPhone version 2
Select the set of questions you require using the Tabs((1-58 or 59-84 or 85-125 or 126-169). If you select the Tab "More" a new window appears giving you the option to obtain information about the content of each set of questions. This should help you decide which question set you want to select.
Select the question set you require using the Tabs
Press the "New Question" button to get the current question.
Press the "Show Answer" button to get the answer to the current question.
When you press the "New Question" button again a new question will appear above the the "New Question" button.
"Answer" will appear above the "Show Answer button
Press the "Show Answer" button to get the answer to the current question.
Please note you cannot go backwards but all questions will be repeated as each cycle of questions is completed.
It does not contain the material covered in most undergraduate lecture courses or elementary texts and it is limited to 1D NMR. Its focus is on practical aspects. It is hoped it will help you interact with NMR operators and set up your own NMR experiments. There is a list of the topics covered below.
What is new in the iPhone version 2.5
The App has been updated and 4 new questions added.
What is new in the iPhone version 2.4
The overlay of text in questions 59-84 has been corrected.
What is new in the iPhone version 2.3
Further Minor bug fixes ensuring compatibility with multiple devices.
What is new in the iPhone version 2.2
Minor bug fixes ensuring compatibility with multiple devices.
What is new in the iPhone version 2.1
In this version the app has been updated with 24 new questions and answers. There are new questions on; using the inversion recovery pulse for determining T1 values, on 18O isotope shifts and their uses in carbon-13 NMR and proton and 13C coupling in 13C-NMR.
What is new in the iPhone version 2.0
In the version 1 there was a single window and you had to answer all 141 questions. This version has the same questions but now has 8 windows. The first four windows give between 25 and 43 questions each which allows you to select the group of questions you want to answer. Windows 5,6,7 and 8 are information windows which list the topics covered by the questions in the windows 1,2,3 and 4.
Topics include
Larmour frequency and NMR operating frequency
Chemical shift
Gyromagnetic ratio
Locking and shimming
Sensitivity and natural abundance 1H,13C,15N, 19F and 31P
Pulse widths
Paramagnetic effects on signals
T2 relaxation and optimum acquisition time
Zero filling
Signal-to-noise
Folding and truncation
Exponential multiplication and linebroadening
T1 relaxation
Ernst equation
Optimising pulse rate and pulse angles
Measuring T1 values using the progressive saturation technique
Measuring T1 values using the inversion recovery technique
Dummy scans
Dipolar and CSA relaxation
Effect of molecular size on dipolar and CSA relaxation
Effect of magnetic field strength on dipolar and CSA relaxation
Solid State NMR
Magic angle spinning
Cross polarisation
CPMAS
Dynamic Nuclear Polarisation (DNP) in solid state NMR
Temperature jump DNP
Instructions for use
For iPhone version 2
Select the set of questions you require using the Tabs((1-58 or 59-84 or 85-125 or 126-169). If you select the Tab "More" a new window appears giving you the option to obtain information about the content of each set of questions. This should help you decide which question set you want to select.
Select the question set you require using the Tabs
Press the "New Question" button to get the current question.
Press the "Show Answer" button to get the answer to the current question.
When you press the "New Question" button again a new question will appear above the the "New Question" button.
"Answer" will appear above the "Show Answer button
Press the "Show Answer" button to get the answer to the current question.
Please note you cannot go backwards but all questions will be repeated as each cycle of questions is completed.
If you have any questions please contact
jpgmprograms@gmail.com