This is my first Essay in English, created in Indonesia 13 syawal 1430 H, because my English lecture advise me to make an essay about chemistry. Please add your comment about structure, vocabulary or it contents.

Simple Mass Spectograph (SMS)-Part 1
Thesis Statement : Mass Spectograph identify atomic weight in four steps, ionization, acceleration, deflection and detection.
The discovery of atomic structure become more complex from year to year. Part of atomic structure is proton, neutron and electron. Proton and neutron in core and electron in certain place outside core which can not be determined absolutely. The mass of electron is very smaller than proton and neutron. So, the mass of atom determined only by proton and neutron. Atomic mass is useful in many chemical reactions such as stoichiometry, radioactivity and others. Mass spectrograph is an instrument to identify atomic weight by four steps, ionization, acceleration, deflection and detection.
The first step is ionization. Ionization means that an atom forced to loose it electron and become positive ion. This is done because mass spectrograph only work with positive ion. Atom will be ionizated, entered into vacuum area and supplied with electricity. This electricity consists many electron which attack atom to loose it electron and go out to the ion repeller machine.
The following step is acceleration. This is done in order that all ion will has same velocity. Many ion from repeller machine will enter three gap. The gap structure is usual, intermediate and zero volt. All ion will be accelerated till focus ray formed.
Deflection is the next step. This part consists of magnet which very sensitive to consideration of atomic weight and netto of ion (w/n). The bigger w/n, the weaker an atom will be deflected. On contrary, the smaller w/n, the stronger an atom will be deflected.
The last is detection. Not all ion can pass through the third step caused there are ion stuck the wall before went out. The other ion which can slip the third step will collide metal box. The metal box will loose it electron and give it to ion and ion will be neutral atom. Because of that, electron space formed id est electron from metal box and and electron in cable. This electron in cable will be detected as electric current and become output. This output will determine atomic weight.
In short, spectrograph is useful to identify atomic weight. This instrument work so accurately by four steps described. This atomic weight will be used in daily needs as important substance in chemical reaction.

Wait the next episode in Physical Chemistry instrument.
Grow up, Indonesia!