2020年04月27日 恭賀島津質譜50週年紀念
島津質譜50週年紀念
了解有關Shimadzu的質譜儀和歷史的二三事後。請持續關注我們的相關社交媒體，並測試相關MS知識！
質譜小測驗
No.2 Nobel Prizes in Mass Spectrometry
Q
Which of the following Nobel Prize winners was not awarded the prize for contributions to the field of mass spectroscopy?
- A Francis William Aston
- B Hans Georg Dehmelt & Wolfgang Paul
- C Akira Yoshino
- D John Bennet Fenn
- E Koichi Tanaka
No.1 Measuring mass from time of flight: TOFMS
TOFMS works on the principle that it takes longer for larger molecules than smaller molecules to travel between the ion source and detector. The mass of the molecule is calculated from the time taken to traverse a certain distance.
In the Shimadzu TOFMS “AXIMA series”, molecules are accelerated by a 20 kV source, and the distance between the ion source and detector is 1.2 m. So try your hand at our quiz questions below!
In the Shimadzu TOFMS “AXIMA series”, molecules are accelerated by a 20 kV source, and the distance between the ion source and detector is 1.2 m. So try your hand at our quiz questions below!
Q1
A Shimadzu engineer is using this TOFMS to measure an amyloid peptide with a molecular weight of 4,331 amu. What does this molecule travel at approximately the same speed as?
- a) A person walking (around 4 km/h)
- b) A car (around 60 km/h)
- c) A plane (around 1000 km/h)
- d) The Earth revolving around the Sun (around 100,000 km/h)
- e) The speed of light (around 1,000,000,000 km/h)
Q2
In this case, how long does it take for the molecule to travel between the ion source and the detector?
- a) 1 second
- b) The time it takes to blink (0.1 second)
- c) The time for a mosquito to flap its wings (2 milliseconds)
- d) One wave period of the highest sound a human ear can hear (50 microseconds)
- e) One wave period of a CPU clock in a PC (0.3 nanoseconds)