
	Where results make sense

Topic: Diatomic molecule

Related Topics

Lewis dot structure

Chlorine

In the News (Sat 2 Jun 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Molecule - Wikipedia, the free encyclopedia
		A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties.
		Although the concept of molecule was first introduced in 1811 by Avogadro, the existence of molecules was still an open debate in the chemistry community until the work of Perrin (1911).
		Molecular spectroscopy is the study of the response (spectrum) of a molecule to a signal characterized by its tunable frequency (or, according to Planck formula, its energy).
	en.wikipedia.org /wiki/Molecule (877 words)

	Diatomic - Wikipedia, the free encyclopedia
		Diatomic molecules are molecules formed of exactly two atoms, of the same or different chemical elements.
		Diatomic elements are those that almost exclusively exist as diatomic molecules, known as homonuclear diatomic molecules, in their natural elemental state, not chemically bonded with other elements.
		The diatomic elements are hydrogen, nitrogen, oxygen, and the halogens: fluorine, chlorine, bromine, iodine, and astatine.
	en.wikipedia.org /wiki/Diatomic (154 words)

	MSN Encarta - Molecule
		They range in size and complexity from the tiny, diatomic molecules (of which the hydrogen molecule is the smallest) to enormous molecules with thousands and thousands of atoms, such as DNA and plastics molecules.
		In a water molecule, the central oxygen atom bonds to two surrounding hydrogen atoms and is left with one nonbonding pair in its valence shell.
		Instead of forming a straight line, the water molecule follows the pattern for a molecule with four atoms, with a central atom in the middle of a triangle formed by the surrounding atoms.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761563983 (2829 words)

	Rotational Spectra of Rigid Rotor Molecules
		The spectra for rotational transitions of molecules is typically in the microwave region of the electromagnetic spectrum.
		For a diatomic molecule the rotational energy is obtained from the Schrodinger equation with the Hamiltonian expressed in terms of the angular momentum operator.
		The rotational spectrum of a diatomic molecule consists of a series of equally spaced absorption lines, typically in the microwave region of the electromagnetic spectrum.
	hyperphysics.phy-astr.gsu.edu /hbase/molecule/rotrig.html (398 words)

	LEOT Laser Tutorial - Course 3: Laser Technology - Module 8: Energy Transfer in Molecular Lasers (Site not responding. Last check: 2007-10-13)
		Diatomic molecules also rotate around an axis perpendicular to the molecular bond and passing through the center of mass of the molecule.
		In a laser, the CO molecule is excited to a high-energy vibrational state by a collision with an electron in the discharge.
		Vibrational energy levels in the electronic ground state of CO molecules also rotate in the same manner as diatomic molecules and with the same result; each vibrational state is split into a number of rotational levels.
	repairfaq.ece.drexel.edu /sam/CORD/leot/course03_mod08/mod03-08.html (6820 words)

	About Sickle Cells - Research
		A molecule has 3N-6 vibrations associated with it, where N is the number of atoms.
		A linear molecule has 3N-5 vibrations, because one of the rotational motions is lost due to the symmetry of the molecule.
		Fig 9.4 The 3 modes of vibration of a non-linear triatomic molecule ABA (i.e.
	www.sicklecellinfo.net /ramandeep.htm (392 words)

	Molecular_noise
		The collision mechanics of a diatomic molecule are analyzed in the
		While the number of molecules colliding with the piston in a given time interval is the same, there are two significant changes: (1) for some collisions both ends of the molecule collide with the piston, and (2) the momentum change per collision is no longer 2mv
		But the average of the square of the momentum change for a diatomic molecule is 0.9565 times the value for a monatomic molecule.
	www.silcom.com /~aludwig/Physics/Noise_floor/Molecular_noise.htm (621 words)

	diatomic molecule concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-13)
		It is the most abundant interstellar molecule after molecular hydrogen and is especially useful because it radiates at radio wavelengths, so astronomers can use it to map the distribution of molecular hydrogen.
		The four transitions that occur near 18 cm are caused by the splitting of the ground level.
		Second, being a symmetric homonuclear molecule, it does not have an electric-dipole rotation-vibration spectrum, and detection must be based on the weak quadrupole spectrum.
	www.csi.uottawa.ca:4321 /astronomy/diatomicmolecule.html (257 words)

	IntrototheDME
		The present version provides for investigation of diatomic molecules formed from arbitrary pairs selected from the elements with atomic numbers 1 - 18, that is hydrogen through argon.
		These are the positions of the two nuclei of the diatomic molecule to be examined.
		This is the energy difference between having the electrons occupy the atomic orbitals of the isolated atoms and having the electrons occupy the molecular orbitals of the diatomic molecule.
	www.bu.edu /smec/qsad/applets/quantum/diatomicexplorer.html (2751 words)

	Molecular model for sound wave derivation
		Divide the molecules in this slice into two groups: all molecules with positive x-velocities go into group A, and all molecules with negative x-velocities go into group B. Group A is about to collide with the surface, and group B has just collided with the surface.
		For a lossless collision of a monotonic molecule, the velocity after the collision must equal the velocity before the collision, the angle with respect to the x-axis at impact is totally random, and clearly the above situation applies.
		For a diatomic molecule, the argument is a little more difficult, since the translation velocity before and after the collision is in general different.
	www.silcom.com /~aludwig/Physics/Main/Molecular_model.html (1402 words)

	Neutral Beam Detection
		To model the gas-phase exchange reaction between a neutral atom (A) and a diatomic molecule (BC) to produce a new species (AB), potential energy surface diagrams were developed which describe the energetics of the reaction as a function of the interatomic distances.
		If the molecule is vibrationally excited, the probability of encountering the local minimum of an early barrier is reduced; however, the presence of additional energy may still increase the probability of a successful crossing at a location that is less than optimal.
		The scattering of the helium atoms is unaffected by the presence of methane molecules seeded in the beam.
	www.princeton.edu /~gscoles/theses/sean/chapter5.html (5713 words)

	The Rotation
		A diatomic molecule differs from an atom in having additional degrees of freedom caused by the ability of the molecule to rotate and vibrate about its center of mass.
		The simplest models for the motion of a diatomic molecule in its electronic ground state are the harmonic oscillator which describes the vibrations of the two atoms along the bond direction and the rigid rotor which approximates the rotation of the molecule in space.
		Since a diatomic molecule is under investigation, only one bond can vibrate and the rotation of the molecule occurs only about an axis perpendicular to the bond direction and through the center of mass.
	www.cartage.org.lb /en/themes/Sciences/Physics/MolecularPhysics/MolecularSpectra/Rotation/Rotation.htm (1860 words)

	Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		Thus, from a structural point of view, a molecule may consist of a single atom, as in a molecule of a noble gas such as helium (He), or it may consist of an aggregation of atoms held together by valence forces.
		Diatomic molecules contain two atoms that are chemically bonded.
		The properties of molecules correlate with their structures; for example, the water molecule is bent structurally and therefore has a dipole moment, whereas the carbon dioxide molecule is linear and has no dipole moment.
	www.britannica.com /ebc/print_toc?tocId=9053247 (913 words)

	Molecular Structure
		The dynamics of the carbon dioxide molecule are very similar to the dynamics of diatomic molecules such as CO or HCl.
		While real diatomic molecules are not perfect harmonic oscillators, their potential energy functions approximate those of a harmonic oscillator for a certain value of inter-nuclear separation.
		As the molecule rotates the oxygen atoms are pulled farther apart by the centrifugal force, therefore increasing the moment of inertia.
	www.phy.davidson.edu /StuHome/jimn/CO2/Pages/CO2Theory.htm (698 words)

	Untitled Document
		The molecule, while it remains extremely "hot" as far as its electronic state is concerned, thus acquires the ambient "vibrational temperature." Fluorescence, when it comes, originates from near the bottom of the upper potential curve, and follows a vertical arrow down (F), until it strikes the lower potential curve.
		Thus, on a diagram of energy (ordinate) versus distance between the nucleii of a diatomic molecule (abscissa), this transition is vertical promoting the electron from the lowest vibrational state of a molecule in the ground state to a higher vibrational state of the excited state (e.g.
		The molecule in the excited state then dissipates immediately (within 10 to 100 fs) some energy as heat and the electron reaches the lowest vibrational level of the excited state.
	www.life.uiuc.edu /govindjee/biochem494/Abs.html (1215 words)

	Search Results for diatomic - Encyclopædia Britannica
		Diatomic molecules have rotational and vibrational as well as translational and electronic degrees of freedom.
		For any real molecule, absolute separation of the different motions is seldom encountered since molecules are simultaneously undergoing rotation and vibration.
		Real molecules are not rigid; however, the two nuclei are in a constant vibrational motion...
	www.britannica.com /search?query=diatomic&submit=Find&source=MWTEXT (348 words)

	Activity 26 Teacher Guide: Whole Body Ozone Chemistry (Site not responding. Last check: 2007-10-13)
		Ozone, a molecule containing three oxygen atoms, is made when UV light breaks the bonds of oxygen molecules containing two oxygen atoms in the stratosphere.
		When this light is used to illuminate an ozone molecule, the ozone breaks up to form a diatomic molecule (a pair of students) and an oxygen atom (single student).
		For example, a molecule of CFC-11 would be composed of one student representing a carbon atom, another representing a fluorine atom, and three students representing three chlorine atoms.
	www.ucar.edu /learn/1_6_2_26t.htm (1933 words)

	L23qc.html
		The simplest model of a diatomic molecule is a rigid rotator.
		The diatomic molecule has no moment of inertia for spin about the internuclear axis since the point masses lie on this axis.
		The molecule does have two equal moments of inertia for end over end rotations relative to two degrees of freedom.
	www.ubishops.ca /ccc/div/sci/chem/224b/L23qc2.html (288 words)

	prac_midterm1_3
		Draw a sketch of the molecule clearly indicating the coordinate system you have chosen and the position of each atom in your coordinate system.
		Gas 1 is known to be composed of homonuclear diatomic molecules.
		Gases 2 and 3 are known to be composed of heteronuclear triatomic molecules of the form AB, where A is oxygen for gas 2 and B is oxygen for gas 3.
	www.nyu.edu /classes/tuckerman/honors.chem/practice/prac_midterm1_3/prac_midterm1_3.html (1019 words)

	Spectra of diatomic molecules
		In a homonuclear molecule, the operator itself is unchanged by the exchange of the two nuclei, since there is still exactly the same arrangement of charged particles as before.
		In this effect, a photon is scattered by the molecule, effectively by an absorption immediately followed by an emission to a state near the original one, so that the frequency of the scattered photon is changed slightly.
		This kind of effect in homonuclear molecules is very helpful in determining the spin of the nuclei, in spite of the fact that these nuclear spins have almost no interaction with the rest of the molecule.
	www.astro.uwo.ca /~jlandstr/p467/lec5-mol_spect (2460 words)

	NBS Monograph 115: 2. Symmetry prop. rotational energy levels (Site not responding. Last check: 2007-10-13)
		In this chapter we discuss the symmetry properties of the rotational energy levels of diatomic molecules [1] (pp.
		The rotational levels of all diatomic molecules can be classified as + or - according to their parity, i.e., according to the behavior of the complete molecular wave function (apart from translation) when the laboratory-fixed Cartesian coordinates of all particles are replaced by their negatives.
		The rotational energy levels of homonuclear diatomic molecules can be classified in addition as s (symmetric) or a (antisymmetric) with respect to permutation of identical nuclei.
	physics.nist.gov /Pubs/Mono115/chap2.00.html (1030 words)

	Diatomic Molecules (Site not responding. Last check: 2007-10-13)
		Let's look at a few diatomic molecules to understand how bond orbitals are put together.
		In fluorine, the filling of an additional antibonding state means that the molecule has a net of only one bond: F2 is very weakly bound and hence highly reactive (and dangerous!).
		It is clear that if we tried to make a similar diatomic molecule with neon, we would fill all the antibonding orbitals, and have a net "bond order" of 0: neon is inert and doesn't form diatomic (or any other) molecules.
	www.batnet.com /enigmatics/semiconductor_processing/CVD_Fundamentals/chemistry/diatomic_molecules.html (794 words)

	Chapter 2
		It is obvious that molecules in a gas are not prevented from rotating, nor is it realistic to expect a molecule that may be deformed by rotation not to vibrate, and indeed both occur simultaneously.
		Although there is an increase in complexity when moving from diatomic to polyatomic molecules, the modifications to the theory for diatomic molecules are logical and not great; as such developments are covered in standard texts only brief mention shall be made of some aspects of polyatomic vibration.
		If this is parallel to the axis of symmetry of the molecule as is the case in the stretch modes of carbon dioxide and the bend and symmetric stretch modes of water, then the selection rules are identical to those for diatomic molecules, namely that DJ = ±1, or DJ = ±1, ±2, ±3,...
	web.ukonline.co.uk /akv/thesis/phd_ch2b.htm (1569 words)

	Molecular geometry and coordinates
		We also note that the spatial orientation of the molecule is arbitrary, since the molecule looks the same at any viewing angle.
		For a diatomic, its orientation can be specified by giving two angles: the angle it makes with the z axis and the angle of its projection onto the xy plane with the x axis.
		In spite of this simplification, it is often necessary to specify all of the coordinates of the atoms in a molecule.
	www.nyu.edu /classes/tuckerman/honors.chem/lectures/lecture_7/node1.html (692 words)

	Molecular Orbital Theory
		The goal of molecular orbital theory is to describe molecules in a similar way to how we describe atoms, that is, in terms of orbitals, orbital diagrams, and electron configurations.
		The molecular orbital diagram for a diatomic hydrogen molecule, H
		We predict the nitrogen monoxide molecule to be unstable according to the Lewis approach to bonding.
	www.mpcfaculty.net /mark_bishop/molecular_orbital_theory.htm (1632 words)

	Diatomic molecules (Site not responding. Last check: 2007-10-13)
		When the molecule vibrates, its moment of inertia changes because the inter-nuclear distance r changes and therefore the rotational energy is modified.
		Homopolar molecules which have no permanent dipole moment are inactive in the microwave region.
		However, like the vibrations, the rotation of the molecule can be observed via the Raman effect in the inelastic scattering of light by the molecule.
	electron6.phys.utk.edu /qm2/modules/m1-3/molecules.htm (1286 words)

	7. Molecular Shapes (Site not responding. Last check: 2007-10-13)
		The optimal geometry of the molecule will be determined by those particular values of the coordinates for which the total energy is a minimum.
		Thus, the total dipole moment is given by the sum of the dipole moments of the individual OH bonds in the molecule.
		The total dipole moment of the water molecule is not zero, a fact that leads to some interesting properties of liquid water and ice.
	scholar.chem.nyu.edu /0109/suppnotes/tuckerman/node8.html (2036 words)

Try your search on: Qwika (all wikis)